Centrifugal Clutch / Manual Clutch options

Pezz

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May 6, 2008
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G'day All

Im building up a 160cc two stroke single into a Pushbike frame.
It will be ported and running an expansion chamber.
I am running a chain based reduction drive and need a clutch.
I will post a thread as it comes together.

My main concern is finding/making a suitable clutch.
I am in a scrapheap challenge with some friends to build and race Motored Pushbikes around a 100acre farm paddock.

Deal is it had to built for be under $200.

I have a Honda CT110 postie Bike engine which is seized but will try to remove the clutch to see if I can modify it.

Just wondering if anyone has any info on a simple clutch design.
Probably around 8-10HP. I know I can buy one but I want to build something up.

:unsure:
 
have you thought about slip belt
tension lever to idle pully

ride that thing
Mountainman
I had, but what ways are there to ensure there was enough slip to make it work with enough grip:unsure:

Hence a modified M/cycle clutch was an option.

Might have to design a simple one and distribute
 
centrifugal clutch

I just looked on ebay and there were a few used centrifugal clutches without bids closing today. You might find a deal for little $$. The trick is finding something that engages at the right rpm range and mates to your engine.

What's your output shaft like?
 
Well how does this sound :unsure:

I can buy the 50cc pocket bike clutches on ebay for $10.
CF clutch.JPG
I was thinking of machining up a piece of pipe to 75mm ID
Putting in a bearing carrier on both ends.
The shaft up the centre has a key way and slide in 3 of these clutches.
On one end of the shaft have a input sprocket mounted for the engine primary chain.
On one end of the barrel an output sprocket mounted.

This should be able to handle the modified Victa engine of 165cc and 6 or 7 HP :)
 
This should be able to handle the modified Victa engine of 165cc and 6 or 7 HP :)
Wouldn't you be wearing the pads off very quickly? As they are designed for engines that are much less powerful.
 
Wouldn't you be wearing the pads off very quickly? As they are designed for engines that are much less powerful.

I think it should be fine, as I am running 3 units beside each other.
The heavy duty ones are for racing and they have the engines tuned for max HP.
I'm going to go and buy them tomorrow to start working it out. I will post pics and developments as I go. The springs allow 2000rpm before full lock up.

It will be interesting to see. Thanks for your reply.
 
How about a go-kart torque converter? Comet has one that can handle like up to 8 hp, but i think you need 7/8 or 1" shaft size. It's just a suggestion. You can find one on ebay for less than $200.
 
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