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Author Topic: CB750 Chain Line  (Read 322 times)

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Offline Wezzo

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CB750 Chain Line
« on: January 24, 2026, 06:02:08 AM »
Afternoon. I have a P&M chassis I’m putting together and am looking to make the spacers for the rear Astralite wheel I’m using. I don’t have the engine close to hand so can I ask if anyone knows the chain line dimensions; centre of the frame/engine to the inside or outside face of the sprocket.

Thanks
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Offline bryanj

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Re: CB750 Chain Line
« Reply #1 on: January 24, 2026, 08:19:16 AM »
Thats not a dimension people look at often, i honestly think you will have to wait till your engine is in, plus it depends on which engine and or chain size you are using.
This board may suprise me though
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Offline Tim2005

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Re: CB750 Chain Line
« Reply #2 on: January 24, 2026, 02:18:14 PM »
I agree with Bryan, wait til it is in the frame. I'm not even sure how you'd decide where the centre of the engine is. 

However, it's good to hear of another P & M CB750 around, I occasionally see the one in the photo at bike meets in Norfolk (UK), and I believe it is one of only 10 or 12 that were made
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Offline newday777

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Re: CB750 Chain Line
« Reply #3 on: January 24, 2026, 10:16:01 PM »
Quote from: Tim2005 on January 24, 2026, 02:18:14 PM
I agree with Bryan, wait til it is in the frame. I'm not even sure how you'd decide where the centre of the engine is. 

However, it's good to hear of another P & M CB750 around, I occasionally see the one in the photo at bike meets in Norfolk (UK), and I believe it is one of only 10 or 12 that were made

And it would be Best to use a laser chain tool to get the correct spacing.
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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, 1 K2, 4 K6, 1 K8, 1 F1, 1 F3
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: CB750 Chain Line
« Reply #4 on: January 25, 2026, 11:25:50 AM »
Quote from: newday777 on January 24, 2026, 10:16:01 PM
Quote from: Tim2005 on January 24, 2026, 02:18:14 PM
I agree with Bryan, wait til it is in the frame. I'm not even sure how you'd decide where the centre of the engine is. 

However, it's good to hear of another P & M CB750 around, I occasionally see the one in the photo at bike meets in Norfolk (UK), and I believe it is one of only 10 or 12 that were made

And it would be Best to use a laser chain tool to get the correct spacing.

That IS a cool gadget!
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Offline MauiK3

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Re: CB750 Chain Line
« Reply #5 on: January 29, 2026, 07:10:29 AM »
Wow, I never knew such a thing existed. Be nice to somehow have a front to back tire version.
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Offline BenelliSEI

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Re: CB750 Chain Line
« Reply #6 on: January 29, 2026, 11:38:53 AM »
Quote from: MauiK3 on January 29, 2026, 07:10:29 AM
Wow, I never knew such a thing existed. Be nice to somehow have a front to back tire version.

Steve….. check out my recent posts in “cool tools” for more info.
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Offline MauiK3

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Re: CB750 Chain Line
« Reply #7 on: January 30, 2026, 08:00:28 AM »
Can you post a link? My feeble skills are not finding it.  Thank you
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1973 CB 750 K3
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Offline Don R

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Re: CB750 Chain Line
« Reply #8 on: January 30, 2026, 10:13:54 AM »
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Offline BenelliSEI

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Re: CB750 Chain Line
« Reply #9 on: January 30, 2026, 10:56:39 AM »
Next time I use it I will posts some good pics.
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