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Author Topic: 1978 CB750K — Post 836 OIL PRESSURE - not good  (Read 247756 times)

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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1225 on: January 29, 2018, 11:23:47 AM »
So thanks to Don, I have hired a mechanic to hopefully re-do my motor once and for all. He came and picked the bike up on Saturday and I am very excited to have a pro go over it.

From our conversation I now suspect that my engine-studs have been stretched out and I was unable to actually torque the head to spec. Also my oil-pump is allowing the side tank to drain all the way into the sump, so when I checked my oil and thought it was low, I most likely over-filled the bike thus causing the many new leaks that occurred on my final ride of my last attempt. I may have installed the rings incorrectly resulting in the blow-by...plus the shaft seal not sealing + possibly one of the cam-tower seals not sealing...anyways. I learned a lot, but apparently not enough yet...looking forward to updates as he goes through the bike. Thank you again Don :)
« Last Edit: January 29, 2018, 12:20:04 PM by SKTP »
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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1226 on: January 29, 2018, 11:45:57 AM »
Quote from: SKTP on January 29, 2018, 11:23:47 AM
So thanks to Don, I have hired a mechanic to hopefully re-do my motor once and for all. He came and picked the bike up on Saturday and I am very excited to have a pro go over it.

From our conversation I now suspect that my engine-studs have been stretched out and I was unable to actually torque the head to spec. Also my oil-pump is allowing the side tank to drain all the way into the sum, so when I checked my oil and thought it was low, I most likely over-filled the bike thus causing the many new leaks that occurred on my final ride of my last attempt. I may have installed the rings incorrectly resulting in the blow-by...plus the shaft seal not sealing + possibly one of the cam-tower seals not sealing...anyways. I learned a lot, but apparently not enough yet...looking forward to updates as he goes through the bike. Thank you again Don :)

The cool thing about Bill is hanging out and learning from him.
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

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1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1227 on: February 06, 2018, 03:34:46 PM »
UPDATE: So I have an experienced mechanic going through my bike to see why it is leaking. Turns out the cheap Harbor Freight torque wrench probably has a lot to do with it. He told me that my engine studs were at 16lbs and that some of the smaller hardware was just finger tight. Lesson learned.

Also, if you have been following my never ending build, the shaft seal leak wasn't a shaft seal leak...turns out there's an O-ring on the timing shaft that I never changed out...he put in a new one and that leak was gone!
« Last Edit: February 06, 2018, 03:50:42 PM by SKTP »
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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1228 on: February 06, 2018, 03:45:18 PM »
Quote from: SKTP on February 06, 2018, 03:34:46 PM
UPDATE: So I have an experienced mechanic going through my bike to see why it is leaking. Turns out the cheap Harbor Freight torque wrench probably has a lot to do with it. He told me that my engine studs were at 16lbs and that some of the smaller hardware was just finger tight. Lesson learned.

Also, if you have been following my never ending build, the shaft seal leak wasn't a shaft seal leak...turns out there's on O-ring on the timing shaft that I never changed out...he put in a new one and that leak was gone!

Something tells me that HF torque wrench is either going to be mangled, thrown away or both!
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2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
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Online calj737

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1229 on: February 06, 2018, 04:33:24 PM »
I know money doesn’t grow on trees, but the 1 thing that I will tell you is, good tools are an investment. If you are doing anything that matters, then you owe it to yourself to use a quality tool. Torque wrenches are critical tools. Their calibration is important, how you treat them is important, else everything you do with them is suspect.

Save up, and spend once on a professional grade torque wrench. You will forever be glad you did.

My most recent purchase:
https://store.snapon.com/TechAngle-174-Models-2-Accuracy-Ratcheting-Flex-Head-3-8-Drive-Flex-Head-TechAngle-Torque-Wrench-5-100-ft-lb--P890313.aspx
From a motorcycle to my diesel truck, it covers it all.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1230 on: February 06, 2018, 04:43:56 PM »
 :o

I wish I had that kind of disposable income.  8)
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"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1231 on: February 06, 2018, 05:03:05 PM »
Obviously when I click the link it is down for a system update....<sad trombone sound>

Quote
Snap-on Update
 
Snap-on Incorporated is the owner of the trademark SNAP-ON registered in the United States and other countries, and also claims rights associated with its unregistered trademarks.
©2017 Snap-on Incorporated; All rights reserved.
 
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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1232 on: February 06, 2018, 05:47:23 PM »
Quote from: SKTP on February 06, 2018, 05:03:05 PM
Obviously when I click the link it is down for a system update....<sad trombone sound>

Quote
Snap-on Update
 
Snap-on Incorporated is the owner of the trademark SNAP-ON registered in the United States and other countries, and also claims rights associated with its unregistered trademarks.
©2017 Snap-on Incorporated; All rights reserved.
 
LOL! They should’ve spent more money on their web server!  ;D ;D ;D

What the link is, a $500 digital torque wrench with 5#-200# range, multiple units of measure, automatic shutoff, and, an angle gauge for torquing out of position. There are times when you need to torque to a spec, then x* past. I have used that torque “angle” feature in my truck countless times, and can’t for the life of me understand how I lived without it.

It is a pricey wrench for sure, but their next model down “Tech Wrench” was in my box for a decade before.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1233 on: February 07, 2018, 11:54:57 AM »
So the motor is out again and the head and jugs are off.

I considered a full-on port and boring to 836cc, etc....but that just gets out of my price range fast (new rods, piston, bore, cam, port, etc = EXPENSIVE)

But since it is apart and there will be a MILD PORT...are there any GO FAST mods that are somewhat economical that I could do? A MILD CAM has been mentioned ($200-$250ish) would that be a good idea? (I already have APE valve springs) its a stock bore...open to all suggestions
« Last Edit: February 07, 2018, 12:08:48 PM by SKTP »
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1234 on: February 07, 2018, 04:06:14 PM »
You could always buy my Wiseco 836 kit, CX7 cam, Stage 4 ported head, HD chains, tensioners and studs, lightened and balanced crank with Cycle X Super Rods, and balanced rotor.
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2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Jerry Rxman Griffin aka MuthaF'er

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1235 on: February 07, 2018, 04:13:14 PM »
Put your rods money into your head. You should be safe at 836 with stock rods.
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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1236 on: February 07, 2018, 04:24:39 PM »
OK. So other than PORTING, there's not much to do to "GO FAST" a stock bore?

Don, your parts are worth more than my entire bike!
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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1237 on: February 07, 2018, 05:15:27 PM »
sure...get a cam...but the really good cams require more compression than stock.  Upping the compression is good for several ponies in it's own right...but the cheapest way to raise compression is new pistons, and then you might as well be doing a big bore!

Seriously though, every part on you bike can be tuned for more power.  Don't just fix broken stuff, improve it.

Fast, Dependable, or Cheap...you only get 2 out 3.  Which do you want?
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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1238 on: February 08, 2018, 01:10:14 PM »
PISTONS $429 http://www.dynoman.net/engine/pistons/honda.html

RODS $599.00 http://cbrzone.com/sohc.html
or $525 http://www.cyclexchange.net/Cranshfts%20and%20Connecting%20Rods%20Page.htm
Let's say $550ish

STUDS $165 http://www.cyclexchange.net/Cylinder%20Studs.htm

CAM $230http://www.cyclexchange.net/camshaftpage.htm

Then Boring, Porting +Gaskets, writs pins, etc...$300 - $1200ish?

Ballpark that's already ballpark-ish $2000 in just parts and machining

Am I wasting my money doing a port and cam? I am after reliability and longevity

Going to call Cycle-X for their thoughts
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1239 on: February 08, 2018, 02:00:45 PM »
To get the best gains out of a cam, you will want to port it and go with higher compression pistons.

Porting will help in any case -- even if just to remove casting marks and improve flow.
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1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1240 on: February 08, 2018, 03:06:18 PM »
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Offline Stev-o

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1241 on: February 08, 2018, 03:45:42 PM »
Some of the other guys may balk, but spending a lot of dollars on trying to get a real-go-fast CB750 may disappoint.  It wont be fast compared to the Duc you used to have.

Would I spend $2K to have my CB go as fast as my Kaw 900? No way!

Just bore to 836, get it reliable and leak free...
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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1242 on: February 08, 2018, 05:20:57 PM »
Pretty sure I am just going to get it ported, tuned and the front end RaceTech'd...
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Offline MauiK3

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1243 on: February 08, 2018, 06:42:52 PM »
Not to hijack......
Steve-o, what Kawa 900 do you have, is it restored?
Steve
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Offline SOHC4 Cafe Racer Fan

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1244 on: February 08, 2018, 09:16:55 PM »
Quote from: SKTP on February 08, 2018, 05:20:57 PM
Pretty sure I am just going to get it ported, tuned and the front end RaceTech'd...

It is equally if not more important to improve the handling (and brakes) than increase your power.

That's why the RC51 has such great stock brakes!
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1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline Stev-o

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1245 on: February 09, 2018, 07:05:03 AM »
Quote from: MauiK3 on February 08, 2018, 06:42:52 PM
Not to hijack......
Steve-o, what Kawa 900 do you have, is it restored?


1975 Z1 900, I restored it 4-5 years ago.
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'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1246 on: March 01, 2018, 03:14:18 PM »
Just shipped my forks to Racetech to get Emulators and new springs!

http://racetech.com/
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Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1247 on: March 13, 2018, 01:06:36 PM »


Since I have grown tired of annually rebuilding my motor, I called in the pros and couldn't be happier!

#professionalhelp
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Offline SKTP

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Re: 1978 CB750K — It never ends! (Round 4 - NEW PLAN)
« Reply #1248 on: March 22, 2018, 03:04:04 PM »
Race-tech is saying I need new "inner fork tubes" to guarantee the forks not leaking. They are saying they will use Forking by Frank and that the tubes are $375...That is crazy high don't you think? http://franksforks.com/

I just talked to the Race Tech sales person and they are saying the Frank's Forks are built from scratch and will take 3 weeks...That sounds insane for stock fork tubes. Any tips on where to buy 1978K for tubes?

Cycle X?
http://www.cyclexchange.net/fork_tubes_and_accessories.htm
« Last Edit: March 22, 2018, 03:17:18 PM by SKTP »
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1978k rebuild thread http://forums.sohc4.net/index.php?topic=68423.0
BIKE OF THE MONTH - OCTOBER 2017
2003 Ducati M800ie
1997 Honda CR-V
2004 Honda CR-V
1966 Honda S90

Online calj737

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Re: 1978 CB750K — It never ends! (Round 4 - FORK TUBES)
« Reply #1249 on: March 22, 2018, 03:40:16 PM »
Inner tubes are more expensive than liters, and personally, 3 weeks seems about right. I bought a few outer sets and they were $260 for 550s
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'74 550 Build http://forums.sohc4.net/index.php?topic=126401.0
'73 500 Build http://forums.sohc4.net/index.php?topic=132935.0

"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis
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