Author Topic: Sandcast Engine #1770 rebuild - it made it!  (Read 14755 times)

0 Members and 3 Guests are viewing this topic.

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #150 on: August 20, 2023, 10:43:37 PM »
The countershaft bearing was rusted almost solid, so it got a new one. The lower case has a full support for this bearing in the sandcast, which is missing in the K0 and later engines. I think it probably ran too close to the oil pump drive gear for Honda's comfort? By recessing that area of the case it allows more splash oil to reach this inner bearing. Good sense: this sucker gets hot when running, being right in the heart of the cases.
« Last Edit: August 20, 2023, 10:46:26 PM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #151 on: August 20, 2023, 10:50:13 PM »
That completes the inside of the bottom end.
 :D
« Last Edit: August 27, 2023, 07:28:48 PM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #152 on: August 20, 2023, 10:53:59 PM »
I had a nice set of all 3 chains from a K3 that suffered a chain-thru-the-cases incident at under 6k miles, and since there are lots of $$ in new parts already in use here, thought this would be a good place to use these to save a few $.
« Last Edit: August 27, 2023, 07:29:29 PM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #153 on: August 20, 2023, 10:58:38 PM »
Now for the smaller parts: the spark advancer had to be refurbished and the springs tightened up. It is and early Hitachi AD125 version, looks a little different from the later ones but suffers the same sacked spring (one only so far) problem. One spring lost a turn in this fixup.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #154 on: August 20, 2023, 11:00:22 PM »
So, your search continues??
David- back in the desert SW!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #155 on: August 20, 2023, 11:02:03 PM »
Spark advancer finished!
Last for today was the clutch lifter: the center bearing was sacrificed to the Rust god. :(
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #156 on: August 20, 2023, 11:03:38 PM »
So, your search continues??

For the Clutch Hub Bearings? I found some from a bearing vendor. Honda doesn't carry them anymore.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,732
  • Bike almost back to the 70's 2015
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #157 on: August 21, 2023, 08:29:43 AM »
The needle bearings inside  primary hub?
Std size possible to find on eBay etc.
Needle bearing 25x32x20

This page has helped me
https://wrenchandspanner.wordpress.com/2014/12/16/cb750f-transmission-bearings/
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #158 on: August 21, 2023, 11:48:02 AM »
The needle bearings inside  primary hub?
Std size possible to find on eBay etc.
Needle bearing 25x32x20

This page has helped me
https://wrenchandspanner.wordpress.com/2014/12/16/cb750f-transmission-bearings/

That's a nicely-done webpage, Per! I hadn't seen that one before. I especially appreciate his comment about reassembling the inner countershaft bearing into the lower case. Yep, "quickly" is the operative word, there. :)

I found the bearings (I think) here:
https://bearingsdirect.com/
We'll see when they come, if they have the same number of rollers, etc. Vendors can vary on that sort of thing. More is always OK unless it is "high-speed" rated, then less by up to 10% is usually the case.

Update: yep they fit!
« Last Edit: August 27, 2023, 07:34:13 PM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #159 on: August 27, 2023, 07:44:01 PM »
Other new surprises: the larger Primary Sprocket bearing (behind the clutch hub) in this sandcast does NOT use the normally-found-here grooved bearing and retainer! While this is good news in terms of not having to source one of those unavailable grooved bearings, it was a surprise. I ordered a normal 6008 bearing for it today. There is also NO snapring groove nor snapring on the end of this mainshaft to retain the clutch hub! I haven't seen this before in the other sandcasts I've done.

Something else that might help one of our members in Italy, need to tell him about this: in the end of the mainshaft on this sandcast, there is a metering hole for the oil that feeds the clutch from the center. This means: much less oil than in the K0 and later bikes' clutches. The later versions have a 4.5mm hole here, not this tiny port! Our Italian friend is suffering dry-clutch problems that result in a very sudden takeoff from dead stop. This is why. This engine also suffered similar troubles: the splines on the shifter spindle are both twisted and partially stripped, indicating harsh shifting was happening. I don't think the bottom-end parts have much in mileage on them: everything looks pristine if it isn't water-damaged or shift-damaged. The cam bearings were not original, nor the cam nor rockers nor shafts, so both the top and bottom of this one suffered troubles, likely caused by improper oil (like, 10w40 high-detergent oil). I know of several (3) sandcasts that exceeded 100,000 miles in original form, but all of them used Castrol XLR their entire lives.

Removing the mainshaft inner bearing was a bugger. It took this long gear puller, lots of torch heat, and cleaning the shaft twice to get it to slide off. The later bikes' shafts here are slightly relieved in diameter between the end of the shaft and this bearing's seat, so once they start moving they usually just slide off - this one is level diameter the whole way!
« Last Edit: August 27, 2023, 08:21:51 PM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #160 on: August 27, 2023, 08:30:50 PM »
Other "bugs" abound in this poor engine. :(
The oil seal on the Neutral Switch was some bizzare too-thick size (like 4mm thickness?) so it both leaked heavily and probably caused Neutral to be impossible to find from being too far out of the case.

The oil filter's O-ring face on the engine is gouged up in several places. This will be tricky to fix!
« Last Edit: August 29, 2023, 07:08:41 AM by HondaMan »
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #161 on: August 27, 2023, 08:42:58 PM »
The spring on the shifter arm is much stronger than those found on the later bikes.

The sandcast and K0 (and early Old Factory K1) engines have these 2 jig reference mounts for jigging the case into the NC (as in, before CNC) machines Honda used in those days to make these cases. My own K1-that-came-in-a-K2 engine (from Honda) has them, and every once in a while I see them in engines from later bikes with K2/3 serial numbers, too. After that, these were replaced by a single ground-to-height post that was cast here (underneath the starter's pocket above it) and the 2 outside rear bolt mounts were used for the reference, plus the center rear hole as the locator - which is why it is so much bigger than the bolt that holds the carb's drain hose bracket there!
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #162 on: August 27, 2023, 08:51:57 PM »
Today's holdup: awaiting some sort of response (still) from CMS about when (or if?) they will ship the grooved output shaft's outer bearing I ordered last week, no news from them yet about it. I hope I don't have to make one, that will be expensive!

I also ordered the inside parts of the final-drive shaft's chain oiler. The K0 versions had 3 little pieces inside: it was essentially a sponge-like plug with rubber seals that slowed the oil from the little pan inside the engine from reaching the hole(s) on the final-drive shaft. The K0 was renown for its oily mess here, though, which generated the later adjustable versions: this one was essentially a medium or large leak. In this engine, all those parts are gone, so without SOMETHING inside this shaft it will drool oil all the time, yuk.

I also had to order the larger outboard primary sprocket's bearing, as I only have some used grooved ones around here. This one is not grooved (but at least is a common 6008 bearing!).
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline CycleRanger

  • No comment about being an
  • Really Old Timer ...
  • *******
  • Posts: 5,477
  • Central Texas Shop Manual Advocate
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #163 on: August 27, 2023, 09:50:17 PM »
Fascinating forensics! :)
Do you have a copy of the Honda Shop Manual or Parts List for your bike? Get one here:
https://www.honda4fun.com/materiale/documentazione-tecnica
CB750K5        '79 XL250s     CL350K3
CB750K3        '76 XS650      '76 CJ360T

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #164 on: August 28, 2023, 02:24:00 AM »
Sad the motor was botched so badly in many ways. The owner is lucky you know the motor well enough to identify and correct the issues and find work around. No substitute for experience some times...
Not a cheap resurrection on this one, what won't cost in 0atts will cost in hours to correct or get fixed by a machine shop in some cases. If you didn't know the issues and have a good list of suppliers, then it would be more costly chasing down things.

Friend did a motor swap in a vehicle he owned buying a vehicle that had sat that was the same model. He started it before pulling the motor out of the donor but has encountered a few things so far. I suggested he would be well served changing out many of the sensors that would be difficult to get to after the motor was put back in. He opted to not do anything like that. Hopefully he changed the rear main seal on the motor. I believe he will have many more issues with this motor because people generally don't just stop using a vehicle unless it has troubles.  He's not that experienced in mechanical work in my opinion. Vehicle is a Mitsubishi SUV...

He has plans to put a Hemi motor in his wife's Jeep Wrangler that has a electrical problem or motor problem that Jeep couldn't figure out nor could a supposedly good independent shop. Even changing ECU and a wiring harness on it could not fix the issue. It has not ran  in over 3 years...
He bought a wrecked Charger from insurance company auction for that transplant after buying a wrecked Ram Hemi pickup that turned out to be incompatible. Not enough research and knowledge.

I wouldn't buy a vehicle from him, personally...
David- back in the desert SW!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #165 on: August 28, 2023, 06:23:26 PM »
Sad the motor was botched so badly in many ways. The owner is lucky you know the motor well enough to identify and correct the issues and find work around. No substitute for experience some times...
Not a cheap resurrection on this one, what won't cost in 0atts will cost in hours to correct or get fixed by a machine shop in some cases. If you didn't know the issues and have a good list of suppliers, then it would be more costly chasing down things.

Friend did a motor swap in a vehicle he owned buying a vehicle that had sat that was the same model. He started it before pulling the motor out of the donor but has encountered a few things so far. I suggested he would be well served changing out many of the sensors that would be difficult to get to after the motor was put back in. He opted to not do anything like that. Hopefully he changed the rear main seal on the motor. I believe he will have many more issues with this motor because people generally don't just stop using a vehicle unless it has troubles.  He's not that experienced in mechanical work in my opinion. Vehicle is a Mitsubishi SUV...

He has plans to put a Hemi motor in his wife's Jeep Wrangler that has a electrical problem or motor problem that Jeep couldn't figure out nor could a supposedly good independent shop. Even changing ECU and a wiring harness on it could not fix the issue. It has not ran  in over 3 years...
He bought a wrecked Charger from insurance company auction for that transplant after buying a wrecked Ram Hemi pickup that turned out to be incompatible. Not enough research and knowledge.

I wouldn't buy a vehicle from him, personally...


That's just scary!   :o
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #166 on: August 29, 2023, 01:24:14 AM »
If your welding buddy who fixes the fins cannot tackle the oil filter mounting boss/face then I would fix it with a good metal filled epoxy that you can surface back level with the rest of the sealing face. It will hold up and last and if your paint sticks to it you won’t be able to tell it was repaired that way….

The number of significant issues/damages to this motor just keeps getting longer, pretty soon one side of a notebook page listing the issues will be filled and you will start page 2, if you aren’t there already.
David- back in the desert SW!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #167 on: August 29, 2023, 07:16:53 AM »
Yep, Raf, that's sort of what I did: I used some of the JB Weld metal type epoxy in the gouges and after it set up, flat-filed it to match the surrounding areas. There's 3 places that were scratched like that on the filter's mount. Hopefully a fresh Honda O-ring in the filter housing will make it seal again. This damage looks like it came from sitting in the shed all those years, probably unprotected. They aren't deep, but also weren't flat.

CMS finally responded to my inquiries: they didn't yet have the little inner washer (felt) for the countershaft oiler, so they were holding the whole rest of the order, including the final-drive bearing that came in last week there. This one's backward from all production 750s in that it has grooves in both the inner and outer bearings on the final-drive shaft.
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,381
  • Old guy
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #168 on: August 29, 2023, 08:04:27 AM »
Fascinating restoration of what is a pretty rare item!!
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline BenelliSEI

  • Really Old Timer ...
  • *******
  • Posts: 10,248
  • 1969 cb750
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #169 on: August 29, 2023, 08:24:35 AM »
Fascinating forensics! :)

+1 to that! I’ve challenged my daughter (she’s the techie in our family) to put all these posts in a printable file! Fascinating!


Offline PeWe

  • Really Old Timer ...
  • *******
  • Posts: 15,732
  • Bike almost back to the 70's 2015
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #170 on: August 29, 2023, 09:56:55 AM »
All struggle must be well worth it when reviving a rare mechanical wonder as a Sandcast!

I'm sure it must feel really good to be the mech God giving life! ;D
CB750 K6-76  970cc (Earlier 1005cc JMR Billet block on the shelf waiting for a comeback)
CB750 K2-75 Parts assembled to a stock K2

Updates of the CB750 K6 -1976
http://forums.sohc4.net/index.php/topic,180468.msg2092136.html#msg2092136
The billet block build thread
http://forums.sohc4.net/index.php/topic,49438.msg1863571.html#msg1863571
CB750 K2 -1975  build thread
http://forums.sohc4.net/index.php/topic,168243.msg1948381.html#msg1948381
K2 engine build thread. For a complete CB750 -75
http://forums.sohc4.net/index.php/topic,180088.msg2088008.html#msg2088008
Carb jetting, a long story Mikuni TMR32
http://forums.sohc4.net/index.php/topic,179479.msg2104967.html#msg2104967

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #171 on: August 29, 2023, 06:32:53 PM »
Yep, Per, there's a great satisfaction in solving the puzzle! When I was in school for NASA we learned (forcibly) how to track failures back to their root cause, thanks in no small amount to Apollo 13's trip. I had to do it for electrical, electronic, and electro-mechanical systems then. When I was in the oilfield, in the Engineering group, I had mentioned in passing to someone that I was trained in [what was then called] 'fault tree analysis', and about 8 months later found myself assigned to doing just that to every major motive-power and pumping system they had (there's LOTS of pumping things in the oilfield!), and had to draw them up, teach them to everyone there, and modify with any new input from the experienced hands who had been there a long time. That took months and really taught me how to trace cause-effect (and cause-effect all the way to 5th levels in some situations) so as to make better designs of new equipment (or mods to existing versions), and after a while it became natural to look at lots of things the same way. I think I've been doing the 750 for so long that I'm on a first-name basis with most of the pieces, now? :D
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline RAFster122s

  • I feel like a really really
  • Really Old Timer ...
  • *******
  • Posts: 12,523
  • SOHC4 member # 2605
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #172 on: August 29, 2023, 10:35:43 PM »
I spent the last 15 years of my career in software quality improvement and control and in my last job I tried teaching the software engineers root cause analysis. They didn't give a s___ and it was pointless, the team was so dysfunctional I could tell you stories that would make your head spin. I hated that job, management was throwing me under the bus for field failures with the customer for software failures and I had nothing to do with the testing group or the software development but since I was the quality guy on the team it was somehow my fault. The logic and fact the government could not see through this bull#$%* astounded me. It was a government contracting position...
The quality auditing I was doing was finding them not following their processes producing the product and they would not address the audit findings I had written up against the team. We had quality issues over a year old the managers ignored and would not assign or allocate team members to address. I reported it to MGMT weekly...it did nothing but drive me in depression.
The most embarrassing team I ever worked with and the MGMT was a joke. We had to step up the contract and my outstanding audit findings became an issue. The SAIC management one layer up at group asked me why I had not addressed these issues on my last meeting with them a week before my last day and SI explained they were not assigned to me that others were responsible for closing and addressing them and I could not address the issues as it was their process I was tasked to assess and as such they needed to address the audit failures not me or Si was no longer independent of the process I was assessing. They had no clue. I told them I had been raising this issue with the SAIC program manager for over a year and he had done nothing to address the issues.
My lob across the PM's now didn't cause any reaction.
They were pathetic too.

The first team at SAIC I worked for were rock stars, couldn't ask for a better high performance team, the last 2 were slow train wrecks.

Glad you could get things whipped in shape at your company. The last two teams I worked for didn't empower me to make the changes needed and suffered as a result. Should have quit and went elsewhere.

Glad you apply what you learned in industry to our Hondas.
David- back in the desert SW!

Offline HondaMan

  • Someone took this pic of me before I became a
  • Really Old Timer ...
  • *******
  • Posts: 14,028
  • ...not my choice, I was nicknamed...
    • Getting 'em Back on the Road
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #173 on: August 30, 2023, 08:42:03 PM »
I spent the last 15 years of my career in software quality improvement and control and in my last job I tried teaching the software engineers root cause analysis. They didn't give a s___ and it was pointless, the team was so dysfunctional I could tell you stories that would make your head spin. I hated that job, management was throwing me under the bus for field failures with the customer for software failures and I had nothing to do with the testing group or the software development but since I was the quality guy on the team it was somehow my fault. The logic and fact the government could not see through this bull#$%* astounded me. It was a government contracting position...
The quality auditing I was doing was finding them not following their processes producing the product and they would not address the audit findings I had written up against the team. We had quality issues over a year old the managers ignored and would not assign or allocate team members to address. I reported it to MGMT weekly...it did nothing but drive me in depression.
The most embarrassing team I ever worked with and the MGMT was a joke. We had to step up the contract and my outstanding audit findings became an issue. The SAIC management one layer up at group asked me why I had not addressed these issues on my last meeting with them a week before my last day and SI explained they were not assigned to me that others were responsible for closing and addressing them and I could not address the issues as it was their process I was tasked to assess and as such they needed to address the audit failures not me or Si was no longer independent of the process I was assessing. They had no clue. I told them I had been raising this issue with the SAIC program manager for over a year and he had done nothing to address the issues.
My lob across the PM's now didn't cause any reaction.
They were pathetic too.

The first team at SAIC I worked for were rock stars, couldn't ask for a better high performance team, the last 2 were slow train wrecks.

Glad you could get things whipped in shape at your company. The last two teams I worked for didn't empower me to make the changes needed and suffered as a result. Should have quit and went elsewhere.

Glad you apply what you learned in industry to our Hondas.

Holy cow, Raf: I thought I was reading a rehash of my last 3 jobs, and the one at Adam Aircraft before those!
Your experience (and mine) are emblematic of the mindset of too much management of ANYTHING related to government-touched projects (or products - even some MIL products). I burned myself out badly during the one at Adam Aircraft (to the point I told management I was carrying to work, and they could either fire me, or let me - they chose the latter in the end) and when they collapsed I took on a short-term job of writing My CB750 Book as my own therapy, not letting anyone else edit, [re]steer, or change the direction I wanted it to go. That took from January to March in 2006, and I felt SO much better after I got that off my chest (wrecked that computer in the process, though!) and made it succeed. This forum was a major portion of that, too. :D

I can offer this: you KNOW what you know - and that, with its acquired skills from the practice of it, is both yours to keep, and to re-employ elsewhere. My last 3 jobs were for people who seemed like 'mental midgets' as I worked with them, as they could never see the forest in front of them for the trees that composed it, and they all got lost in wandering after nuisance details that meant nothing to the success of their projects. After I watched the 4th one fail I decided to head off on my own and started in that direction: about 4 days later they decided they didn't need me there, either. After I left they lost over 75% of their people (employees) because of such poor work quality that they simply ran out of customers willing to risk another undertaking with them.

So - remember it's not you, it's them. The hard part (for me) during the past 7 or 8 years has been in trying to find someone to work for/with who "gets it" and also has a project worth diving into and spending a portion of your life on: oddly enough, I've received this sort of therapy from helping others here realize their joys and dreams of riding one of these great bikes that had such an influence over my own life. So, I'm happy to spread whatever I know around! The rest of the time I work at a gun range (one of my other passions involves making lead fly realfast) and return the used brass from their floors to the hands of those who would reload them and make them do it again. You meet the nicest people on a Honda, and behind a trigger! :D
See SOHC4shop@gmail.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book

Link to website: www.SOHC4shop.com

Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,381
  • Old guy
Re: Sandcast Engine #1770 rebuild - I hope?
« Reply #174 on: August 31, 2023, 10:24:45 AM »
Your book was my salvation on my K3 project.
Thank you
1973 CB 750 K3
10/72 build Z1 Kawasaki