Author Topic: My K8 re-conditioning  (Read 18912 times)

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Offline denward17

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Re: My K8 re-conditioning
« Reply #400 on: August 11, 2023, 08:57:53 AM »
650 mile update:

Bike is running good, my first 7-8K RPM (3rd gear) experience this morning, pulled strong.

I've been slowly adjusting the idle mixture screws (backing out) trying to get the lean-ness out while just barely on the throttle.  My latest adjustment this morning appears to have helped with tip-in.  That's what I call it anyway; when you are making a turn at an intersection, drop down to either 2nd gear (or 1st) and very slowly ease into the throttle.

Screws are approximately 1 7/8 to 2 turns out.

Offline BenelliSEI

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Re: My K8 re-conditioning
« Reply #401 on: August 11, 2023, 04:05:35 PM »
Sounds good and nice to hear all your efforts have been rewarded. Congrats on a really good job!

Offline grcamna2

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Re: My K8 re-conditioning
« Reply #402 on: August 11, 2023, 05:11:26 PM »
Your bike looks Very nice  8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline MRieck

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Re: My K8 re-conditioning
« Reply #403 on: August 11, 2023, 06:43:49 PM »
650 mile update:

Bike is running good, my first 7-8K RPM (3rd gear) experience this morning, pulled strong.

I've been slowly adjusting the idle mixture screws (backing out) trying to get the lean-ness out while just barely on the throttle.  My latest adjustment this morning appears to have helped with tip-in.  That's what I call it anyway; when you are making a turn at an intersection, drop down to either 2nd gear (or 1st) and very slowly ease into the throttle.

Screws are approximately 1 7/8 to 2 turns out.
It should pull strong.
Owner of the "Million Dollar CB"

Offline denward17

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Re: My K8 re-conditioning
« Reply #404 on: August 12, 2023, 09:59:05 AM »
I made the mistake of creating and updating a spreadsheet with all the costs I incurred while re-conditioning this bike, boy was I surprised.

I had 2 columns, one directly related to parts and machine services, one for cleaning supplies/a few different tools I needed (ultrasonic cleaner, sand paper, etc.)

Both columns added together was a shocker.....but if I do another bike, at least I have the tools needed and shouldn't need to spend much in that area.

And yes, I have way more in it than what it is worth, but it gave me something to do after retirement and I can't put a cost on how much enjoyment I received from working on it. 

And the best part, I now have a nice bike to ride.

Offline PeWe

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Re: My K8 re-conditioning
« Reply #405 on: August 12, 2023, 10:21:23 AM »
Same with my 2 CB750's.
I'll never get my money back what spent on restore.

Especially  my blue K6. Only the engine cost like a good bike.
But I have no regrets.
Maybe I can get most back if I sell my brown K2.

Despite it was a part bike. Started with empty cases, my K6 old crank with rods and a frame with tank I found nearby.
Then new parts, old parts from friend, eBay, Yamiya etc.

I have a new CB750 project. 890cc is the plan.
« Last Edit: August 12, 2023, 10:34:00 AM by PeWe »
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 BenelliSEI

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Re: My K8 re-conditioning
« Reply #406 on: August 12, 2023, 04:30:34 PM »
You have the satisfaction of knowing your machine is done “right” and will reward you going forward. Amortized over several years of making you smile, I’d say it’s priceless! Ultimately it’s probably less than the depreciation of a new car, on day one…..
« Last Edit: August 16, 2023, 08:39:01 AM by BenelliSEI »

Offline Stev-o

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Re: My K8 re-conditioning
« Reply #407 on: August 16, 2023, 07:09:30 AM »
I made the mistake of creating and updating a spreadsheet with all the costs I incurred while re-conditioning this bike

Big mistake!   
Personally, I would never do that, if the wife got a glimpse of it she would flip! 
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline denward17

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Re: My K8 re-conditioning
« Reply #408 on: August 17, 2023, 01:42:32 PM »
I made the mistake of creating and updating a spreadsheet with all the costs I incurred while re-conditioning this bike

Big mistake!   
Personally, I would never do that, if the wife got a glimpse of it she would flip!

LOL, I know what you mean....

Offline denward17

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Re: My K8 re-conditioning
« Reply #409 on: October 03, 2023, 06:35:39 PM »
About 850 miles since completing.....still running great.

The last 2-3 rides, I started noticing that the push button start sometimes would not work, but I would hear a click.

I took off the starter solenoid, took it apart and cleaned the copper contacts. (Forgot to get a picture of that).

After a few tests, it still would on occasion not crank the engine, so I took the start button switch apart.  I wanted to try to repair, but after fusing with it for about an hour, decided to just order a new one.

It was really nasty inside, I then cleaned and was guessing at how the little parts went back in.

I assumed the little copper sliders fitted lengthwise with the small hard fiber separator in between.  I tried multiple times to fit back together, but the springs kept either popping out or moving the fiber separator away from the copper sliders.

Pic of affected part.

Offline BenelliSEI

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Re: My K8 re-conditioning
« Reply #410 on: October 03, 2023, 07:17:57 PM »
I’ve repaired a few of the early switches but that one defeated me. Like you I just ordered a replacement!

Offline denward17

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Re: My K8 re-conditioning
« Reply #411 on: October 06, 2023, 11:15:14 AM »
New start button switch was installed today, still having intermittent starting issues.

I have ordered a new starter solenoid, and hopefully that fixes the issue.

Offline grcamna2

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Re: My K8 re-conditioning
« Reply #412 on: October 06, 2023, 11:29:21 AM »
New start button switch was installed today, still having intermittent starting issues.

I have ordered a new starter solenoid, and hopefully that fixes the issue.

I hope the switch is properly Grounding to complete the connection to the start button.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline denward17

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Re: My K8 re-conditioning
« Reply #413 on: October 06, 2023, 12:21:26 PM »
New start button switch was installed today, still having intermittent starting issues.

I have ordered a new starter solenoid, and hopefully that fixes the issue.

I hope the switch is properly Grounding to complete the connection to the start button.

^The ignition switch or the push button switch?

Offline grcamna2

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Re: My K8 re-conditioning
« Reply #414 on: October 06, 2023, 12:26:19 PM »
New start button switch was installed today, still having intermittent starting issues.

I have ordered a new starter solenoid, and hopefully that fixes the issue.

I hope the switch is properly Grounding to complete the connection to the start button.

^The ignition switch or the push button switch?

I handlebar switch.
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline denward17

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Re: My K8 re-conditioning
« Reply #415 on: October 13, 2023, 11:55:28 AM »
Received the starter solenoid today and got it installed.  I started the bike about 8-10 times and it hit every time.
I guess I can assume this was the cause of my issues.

Went for about a 30 mile ride, beautiful weather in N Carolina today, about 75 degrees.

Offline newday777

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Re: My K8 re-conditioning
« Reply #416 on: October 13, 2023, 12:25:56 PM »
Received the starter solenoid today and got it installed.  I started the bike about 8-10 times and it hit every time.
I guess I can assume this was the cause of my issues.

Went for about a 30 mile ride, beautiful weather in N Carolina today, about 75 degrees.
Good to hear you got it sorted.
I went out for a few miles today up here in NH. Crisp fall day @ 60°.
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline BenelliSEI

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Re: My K8 re-conditioning
« Reply #417 on: October 13, 2023, 12:45:08 PM »
Nice fix! We got out today, crisper here, closer to 50f!

Offline grcamna2

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Re: My K8 re-conditioning
« Reply #418 on: October 13, 2023, 01:35:04 PM »
Received the starter solenoid today and got it installed.  I started the bike about 8-10 times and it hit every time.
I guess I can assume this was the cause of my issues.

Went for about a 30 mile ride, beautiful weather in N Carolina today, about 75 degrees.
Good to hear you got it sorted.
I went out for a few miles today up here in NH. Crisp fall day @ 60°.

Looking Great Stu  8) 8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline RAFster122s

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Re: My K8 re-conditioning
« Reply #419 on: October 13, 2023, 02:13:18 PM »
Gorgeous shot Stu, time to get out and enjoy it now while it is there before the gray clouds and dreary winter set in for the long dull winter. It was that way when I lived in Ohio, what a depressing place it was.
David- back in the desert SW!

Offline newday777

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Re: My K8 re-conditioning
« Reply #420 on: October 13, 2023, 03:43:14 PM »
Thanks guys. It's still rideable here hopefully for another month.....
Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline denward17

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Re: My K8 re-conditioning
« Reply #421 on: October 19, 2023, 11:49:28 AM »
Put a few miles on today, beautiful weather, about 71 degrees F.

970 miles since rebuilding top end, so far, no leaks, no smoke and no oil burning.

Running great!

A guy on a Harley pulled up beside me at a stoplight today, he couldn't believe how clean the bike is, said he was very impressed and loved the older bikes.

« Last Edit: October 19, 2023, 11:51:40 AM by denward17 »

Offline BenelliSEI

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Re: My K8 re-conditioning
« Reply #422 on: October 19, 2023, 12:05:20 PM »
It does look great and runs even better! Well done.

Offline grcamna2

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Re: My K8 re-conditioning
« Reply #423 on: October 19, 2023, 01:14:33 PM »
It does look great and runs even better! Well done.

Yeah !  The bike is looking real good denward17  8) 8)
75' CB400F/'bunch o' parts' & 81' CB125S modded to a 'CB200S'
  I love the small ones too !
Do your BEST...nobody can take that away from you.

Offline denward17

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Re: My K8 re-conditioning
« Reply #424 on: October 19, 2023, 01:39:06 PM »
^Thanks Guys.....