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Author Topic: Bore Clearance for Yosh 823 Kit?  (Read 911 times)

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Offline Finnigan

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Bore Clearance for Yosh 823 Kit?
« on: February 08, 2024, 04:41:28 pm »
NOS 823 kit with rings, about to send to machine shop but I realized I don't have instructions or literature from Yoshimura for clearances.  Anyone know of a reference?
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Offline Tracksnblades1

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #1 on: February 09, 2024, 03:21:10 am »
Pictures…?

I’ve read yoshimura believed in cast piston and ART manufactured them for Honda and Yoshimura..?
Reach out to gschuld he may have some original Yoshi clearance publications …
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Offline newday777

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #2 on: February 09, 2024, 03:29:33 am »
Contact Curt Jordan in Oceanside CA. He has all his notes from the motors he has built from the 70s to today.  He is a wealth of knowledge building race motors a long time.

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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 Finnigan

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #3 on: February 09, 2024, 07:52:38 pm »
Quote from: Tracksnblades1 on February 09, 2024, 03:21:10 am
Pictures…?

I’ve read yoshimura believed in cast piston and ART manufactured them for Honda and Yoshimura..?
Reach out to gschuld he may have some original Yoshi clearance publications …
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Offline Finnigan

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #4 on: February 09, 2024, 08:00:39 pm »
a couple more, having a hard time getting these to load
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Offline newday777

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #5 on: February 10, 2024, 01:44:10 am »
Did you call Curt?
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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 HondaMan

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #6 on: February 10, 2024, 10:13:15 am »
Those look to be cast pistons. I'd set the clearance at 0.0010"-0.0012" if I were making the engine for someone.
« Last Edit: February 10, 2024, 01:13:46 pm by HondaMan »
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Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

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Offline MRieck

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #7 on: February 10, 2024, 11:34:49 am »
Quote from: HondaMan on February 10, 2024, 10:13:15 am
Those look to be cast pistons. I'd set the clearance at 0.0001"-0.0012" if I were making the engine for someone.
If I remember correctly it was .0012....I had them in an engine about 40 years ago.
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Offline Finnigan

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #8 on: February 10, 2024, 11:56:11 am »
Yep got a hold of Curt, very nice chatting on the phone and I’ll likely try to take my pistons to his shop. Only a 45 min drive for me.  Thanks for the lead!
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Offline newday777

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #9 on: February 10, 2024, 12:05:38 pm »
Quote from: Finnigan on February 10, 2024, 11:56:11 am
Yep got a hold of Curt, very nice chatting on the phone and I’ll likely try to take my pistons to his shop. Only a 45 min drive for me.  Thanks for the lead!
He's a great guy
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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 Tracksnblades1

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #10 on: February 10, 2024, 12:49:32 pm »
Interesting valve relief on your last picture….🤔
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Offline MRieck

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #11 on: February 10, 2024, 01:13:40 pm »
Quote from: Tracksnblades1 on February 10, 2024, 12:49:32 pm
Interesting valve relief on your last picture….🤔
It is. The exhaust valves are directional....that relief allows any piston to go in any bore. Wiseco has done it that way too as well as others.
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Offline HondaMan

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #12 on: February 10, 2024, 01:15:03 pm »
Quote from: MRieck on February 10, 2024, 11:34:49 am
Quote from: HondaMan on February 10, 2024, 10:13:15 am
Those look to be cast pistons. I'd set the clearance at 0.0001"-0.0012" if I were making the engine for someone.
If I remember correctly it was .0012....I had them in an engine about 40 years ago.

Thanks for re-posting on it so it brought it back to me: I just noticed the misplaced "1" in the first number! That 0.0001" would be a loooong break-in... :(
It should have been 0.0010" .
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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 newday777

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Re: Bore Clearance for Yosh 823 Kit?
« Reply #13 on: February 10, 2024, 02:00:05 pm »
Quote from: HondaMan on February 10, 2024, 01:15:03 pm
Quote from: MRieck on February 10, 2024, 11:34:49 am
Quote from: HondaMan on February 10, 2024, 10:13:15 am
Those look to be cast pistons. I'd set the clearance at 0.0001"-0.0012" if I were making the engine for someone.
If I remember correctly it was .0012....I had them in an engine about 40 years ago.

Thanks for re-posting on it so it brought it back to me: I just noticed the misplaced "1" in the first number! That 0.0001" would be a loooong break-in... :(
It should have been 0.0010" .
I did see that but chose not to mention it.
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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 Tracksnblades1

  • My Son was a collegiate competition Trap, Skeet, and sporting Clay
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Re: Bore Clearance for Yosh 823 Kit?
« Reply #14 on: February 10, 2024, 02:14:35 pm »
Quote from: MRieck on February 10, 2024, 01:13:40 pm
Quote from: Tracksnblades1 on February 10, 2024, 12:49:32 pm
Interesting valve relief on your last picture….🤔
It is. The exhaust valves are directional....that relief allows any piston to go in any bore. Wiseco has done it that way too as well as others.

Interesting. Good to know… The last pistons I bought for a 750 were 71.25mm Wiseco’s… mine don’t look to share the ambidextrous abilities. Unless they have removed the tab. Mine look machines like the  wisecos Kenny has advertised with the coatings..
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