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Author Topic: At long last - CB750 Clutch hub mod.  (Read 3829 times)

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Offline HondaMan

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At long last - CB750 Clutch hub mod.
« on: June 04, 2006, 08:55:57 PM »
Here's a shot of my modified clutch hub, with the extra oil holes.

What you cannot see, because I could not shoot it effectively, is that the inside of these holes are chamfered - in fact, all of them are now. This really helps smooth out the clutch on CB750.
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Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

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Offline chung

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Re: At long last - CB750 Clutch hub mod.
« Reply #1 on: June 04, 2006, 09:33:07 PM »
I am not familiar with this mod. Please explain what this is supposed to do and how it does it? As well as any other Mods to the clutches...Springs, Friction plate material ect ::)
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Offline Bob Wessner

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Re: At long last - CB750 Clutch hub mod.
« Reply #2 on: June 05, 2006, 02:36:06 AM »
Does this help with the occasional "grabiness" I've noticed, particularly in hot weather??
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Offline MRieck

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Re: At long last - CB750 Clutch hub mod.
« Reply #3 on: June 05, 2006, 04:41:46 AM »
I switched to a 78F set up with the wave washer steel plate. Much better.
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eldar

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Re: At long last - CB750 Clutch hub mod.
« Reply #4 on: June 05, 2006, 06:39:34 AM »
While this mod is probably more for the earlier 750s, it sounds kinda cool. I probably dont need it though. The only time I have shift problems is getting into neutral while at a stop and even that is not too hard. The only other time I have issues is from user error! My bike shifts better than many new bikes I have ridden.
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Offline byidesign

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Re: At long last - CB750 Clutch hub mod.
« Reply #5 on: June 05, 2006, 07:47:21 AM »
Nice pic....Thanks for the info
             Bruce
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Offline Bob Wessner

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Re: At long last - CB750 Clutch hub mod.
« Reply #6 on: June 05, 2006, 07:55:10 AM »
Probably a dumb question (who better to ask ;D) The holes alternate around and front to back to not compromise strenght?? And are between plate locations?? OK, that was two dumb questions.  :D
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Offline HondaMan

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Re: At long last - CB750 Clutch hub mod.
« Reply #7 on: June 05, 2006, 09:26:58 PM »
Quote from: Bob Wessner on June 05, 2006, 07:55:10 AM
Probably a dumb question (who better to ask ;D) The holes alternate around and front to back to not compromise strenght?? And are between plate locations?? OK, that was two dumb questions.  :D

This mod reduces the suddenness of the clutch engagement, particularly in hot weather and with lower viscosity oils.

Yes, try to make the holes between the steel plates. This is easy, given that the plates have marked the hub for you already.  ;)
Also, add holes only down in the "valleys", not on the splines. This ensures that you don't damage the hub's strength.

Besides, the hub in the picture was raced 4 years, then driven to 112,000 miles before I took this picture. It's a tough piece!
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See SOHC4shop.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 My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline Bob Wessner

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Re: At long last - CB750 Clutch hub mod.
« Reply #8 on: June 06, 2006, 02:16:59 AM »
Quote
Besides, the hub in the picture was raced 4 years, then driven to 112,000 miles

Yipes, mine's not even broken in yet! Says a great deal about the durability of these machines.
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