Centrifugal Clutch One-Way Bearing Won't Engage

Louie

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Just installed a centrifugal clutch on my 66cc engine (which has been running fine with a friction clutch for 200 miles). Can't pedal it at the moment because the cranks don't clear the case. To try and start it, I just coast down my driveway and then pop the friction clutch. I'm getting nothing but the clutch bell spinning. When i slowly walk the bike, I can get the one way bearing to engage but nothing beyond that and certainly not long enough or securely enough to get the engine to start.

What am I doing wrong? Does the bolt that holds the whole assembly together need to be even tighter?
 
That's not the problem, the friction clutch is still transferring motion to the bell of the cent clutch. Somehow the one way bearing only engages when I mess with it.
 
Just installed a centrifugal clutch on my 66cc engine (which has been running fine with a friction clutch for 200 miles).
You need the other half of the kit bud, another way to start the engine.

The only way to start a CF clutch engine is with a pull start or electric start on the engine.
The Zelda (or whatever it was called) engine kit has a CF clutch but both a pull start and an electric start ability and an internal power source to keep the battery charged.

Your drive is connected to the bell, and it don't matter how fast you spin the bell, it's not going to magically squeeze in and grab the clutch pads, a running engine spreads them out to make contact.

I have no clue what you are talking about with a one-way bearing in there with a CF clutch means either, or why one would be needed anywhere other than if you were jackshafting to use your bike gears to allow your pedals to not spin when under engine power.

Done right there is no clutch lever, you just need a different way to start the engine.
 
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No, with these clutches they have a one way bearing that still allows you to pedal start. I have been able to get it to engage but not enough to start the engine.
 
No, with these clutches they have a one way bearing that still allows you to pedal start. I have been able to get it to engage but not enough to start the engine.
By all means please tell us about this magical CF clutch that apparently don't work!
 
By all means please tell us about this magical CF clutch that apparently don't work!

Whoa KC, this is possible.
Power from engine to wheel over runs the one-way clutch, has to go through friction pads.
Power from wheel to engine engages the one-way clutch, will allow bump starting.
I've never seen it, but I can see the theory on a CF friction clutch, not a CV belt type.

One way clutches are either positive action ratchet types or sprag action friction types.
If it clicks freewheeling it is a ratchet, if it is silent it is a sprag.
https://en.wikipedia.org/wiki/Sprag_clutch
We use one-way clutches (often called one-way bearings) in industry a lot and often in a similar application.

If it slips it is usually a sprag clutch and it is usually a wear or lubrication issue.
Basic mineral oil like Automatic Transmission Fluid (ATF) is the best lube for them.
They will slip if motor oil, grease, moly, STP, graphite, teflon, synthetic oil, soap or wax get on them.

Clean it out behind the seals with spray brake cleaner and relube with ATF.

Steve
 
Whoa KC, this is possible.
Power from engine to wheel over runs the one-way clutch, has to go through friction pads.
Power from wheel to engine engages the one-way clutch, will allow bump starting.
I've never seen it, but...
Steve
Steve, I have no desire to quarrel in forums with you.
I asked for a link or something to explain how there is some magical way to make a typical CF clutch fixed bell somehow engage typical clutch pads on and engine that it is off.

CFclutch.jpg


When the running engine spins fast enough the pads held in by springs spread out to make contact with the bell and engage the drive.

What the heck kind of SF clutch you have never seen that will work the other way are you talking about?
Or should I go look it up in Harry Potter books, because you can pedal spin that bell as fast as you want but it won' engage the engine pads.

Steve, all I am asking for is into on this system you bought that obviously hasn't worked for you, and why you somehow thougt it would is all.
 
OOO...Touchy!
Hehe...
Ya, it's hard to dispute actual pictures of how the thing works using actual MB parts.
Don't get me wrong here... I love innovation!
This just wasn't one that can ever work without another way to start the engine is all.
 
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