Clutch Lever Pivot

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spookefoote1956
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Clutch Lever Pivot

Post by spookefoote1956 »

Hello again. Some investigation has led me to believe that the clutch lever pivot for my bike should have a 7/8" pivot. Due to having a transplanted Yamaha front end, which in turn means disc brake, my levers are obviously of a more modern design.

Does the 7/8" pivot ensure more travel for the clutch push rod which means better separation of the clutch plates and is it possible to obtain more modern looking clutch levers with this pivot measurement?

Cheers, Chris
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56G80S
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Re: Clutch Lever Pivot

Post by 56G80S »

From personal experience it's less about better separation and more about ease of operation.

Since I fitted the 7/8" pivot levers the clutch hasa been so much easier to use.

Not clear why they need to be more modern looking? Then again, I do understand that you may be looking for match with the front brake lever.

Johnny B
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Re: Clutch Lever Pivot

Post by SPRIDDLER »

spookefoote1956 wrote: Due to having a transplanted Yamaha front end, which in turn means disc brake,
and therefore hydraulically not cable operated? Please clarify.
Does the 7/8" pivot ensure more travel.......
More travel than what.....? Certainly a 1" pivot will provide more travel than a lever with say 7/8" centres, but it will take more hand effort to operate than a lever with 7/8" centres .
for the clutch push rod which means better separation of the clutch plates and is it possible to obtain more modern looking clutch levers with this pivot measurement?
I think you must have an hydraulically operated brake and the ratio between the master and slave cylinder piston diameters is relevant to the amount of throw of the lever(s) and the effort required on the lever.
Last edited by SPRIDDLER on Sun Jul 15, 2018 9:41 pm, edited 1 time in total.
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spookefoote1956
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Re: Clutch Lever Pivot

Post by spookefoote1956 »

Exactly, I would need the clutch lever to match the brake lever, as near as possible. Although if the 7/8" would give better separation then it would make another interesting talking point!
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
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Re: Clutch Lever Pivot

Post by SPRIDDLER »

spookefoote1956 wrote:Although if the 7/8" would give better separation then it would make another interesting talking point!
Or not............ :roll:
If your cable operated clutch is set up correctly and you have the correct lever there is no need to faff about with it. Anyway, do you pull your bike backwards a lot when in gear?
;)
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spookefoote1956
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Re: Clutch Lever Pivot

Post by spookefoote1956 »

Not sure why the brake being hydraulic or not (it is) makes much difference as I'm enquiring about the clutch lever and whether the 7/8" pivot allows more push rod travel than my current clutch lever which appears to be well over an inch.
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JimFitz
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Re: Clutch Lever Pivot

Post by JimFitz »

Hi Chris
I have the same dilemma with my BSA Super Rocket. It has 1 1/8" pivot to cable levers and they should be 7/8" which makes the clutch heavier than it should be.
The 1 1/8" pivot will give greater separation (clutch pushrod movement) than 7/8" but the effort required on the lever will be greater.

Jim
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spookefoote1956
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Re: Clutch Lever Pivot

Post by spookefoote1956 »

Thanks Jim, that was just what I needed. I'll stick with the current set up and look at the plate end. I'm trying to minimise the clutch crunch going into gear one. Any ideas?
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Duncan
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Re: Clutch Lever Pivot

Post by Duncan »

I'm trying to minimise the clutch crunch going into gear one. Any ideas?
You could try transplanting a Yamaha engine and back end?


Check the clutch basket for wear and plates for burrs, Burman boxes are a littke less refined than AMC ones.
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spookefoote1956
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Re: Clutch Lever Pivot

Post by spookefoote1956 »

Knew I should have bought the whole TDR! I'll give the clutch a look over ........ or fit an AMC one!
Hail Joe Lucas ............ Prince of Darkness!
All my bikes are original........ to me!
"Creativity is your intelligence having fun" Albert Einstein
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