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Old 06-19-2008, 05:03 PM   #1
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Default Clutch Problem

Hi Guys

Just wanted to find out if the collet should sit flush within the fly wheel or should part of the collet stick out the back of the fly wheel? Currently there is about 1mm+ of collet sticking out from the fly wheel and I think it might be causing issues but cant be sure.

Any help would be appreciated.

Cheers
Adrian
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Old 06-19-2008, 05:05 PM   #2
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It should stick out just a bit. If it was totally flush the flywheel would rub the motor. What issues are you having?
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Old 06-19-2008, 06:16 PM   #3
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Im finding that when I screw the main screw into the crank shaft after everything has been completed the flywheel doesnt spin freely at all because the clutch bell has been tightened on the shoe.

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Old 06-19-2008, 06:28 PM   #4
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Quote:
Originally Posted by vazzo View Post
Im finding that when I screw the main screw into the crank shaft after everything has been completed the flywheel doesnt spin freely at all because the clutch bell has been tightened on the shoe.

Cheers
Adrian
\

I think we get the picture. It seems when everything is assembled you don't have any endplay left. But this should not cause the flywheel not to spin but rather cause the clutchbell not to spin independently of the crankshaft. Look and see how much room you have left between the flywheel and the crankcase. You don't want the flywheel touching the crankcase; but you also don't won't a huge gap. This will cause you to have no endplay once everything is assembled. I take it you are talking about a centax style clutch.
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Old 06-19-2008, 07:41 PM   #5
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Your 100% spot on mate, I did mean clutch bell doesnt spin freely and I think your spot on with that space casused by the collet, there is about 1mm of gap between the crank case and flywheel. I upgraded the flywheel as well so I might go back to my old flywheel and try it again using mike swaugers clutch build tips as the old flywheel didnt create as much gap and I was able to spin the clutch bell when the centax clutch was complete.

Thanks guys, Ill try that and let you know how I go.

Cheers
Adrian
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Old 06-19-2008, 07:51 PM   #6
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I assume you have a Mugen clutch. Are you using one of those big brass collets or a steel one like Nova motors come with? The steel ones seem to be a bit smaller and will give you more end gap.

What kind of motor do you have? I never measured the crank but OS motors always gave me less end gap like the crank was a bit shorter.

Are you using a red shoe? They are a bit thicker. I always had to use old ones on my OS and saved the new ones for Nova motors.

As a last resort you can use the little shims that come with a nitro TC3 clutch bolt and shim kit. Put the shim over the bolt between the crankshaft and the end cap/thrust bearing holder thing (sorry, don't remember the actual name for that thing). That will push it out further to give you more end gap.
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Old 06-19-2008, 08:33 PM   #7
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If you like the upgraded flywheel;I would just try a different collet. All collets are not the same. Whatever flywheel you go with just makesure you keep the gap between the engine crankcase and the flywheel to a minimum but not touching.


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Old 06-20-2008, 02:27 AM   #8
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what about shims before the bell bearing, to make the bell stand away a bit further????
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Old 06-20-2008, 07:24 AM   #9
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If you don't have enough end gap to begin with that will just crush the bearings.
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