Centrifugal Clutch Fix?

Baconator101

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Apr 2, 2017
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254
My clutch bell just detached itself from the small gear cog. It seems as though it was just pressed in, no solder or weld marks on it.

If not fixable anybody have any luck on purchasing a decent quality one lately?
 


Frankenstein

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Jun 24, 2016
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It absolutely is pressed in, mine got cannibalized unfortunately, the gear is of some rather brittle material, when put into a vice it broke into shards like it was an incredibly cheap chrome type steel. Imagine the stuff the free coupon harbor freight 4 piece screwdriver sets are made of, that type of steel... Like you can bend and snap it in 2 or 3 bends.

You might be able to weld it though I have a slightly different idea should you not think it is possible or even a good idea to weld. It's not very good and doesn't stop the gear from working loose again.. I share if no hope. I think the bell sits high enough you could put tacs on it on the side with the main part of the gear, i think the other side (inside the bell) needs to be smooth and flush but I might be wrong.
 

Baconator101

Active Member
Joined
Apr 2, 2017
Messages
254
It absolutely is pressed in, mine got cannibalized unfortunately, the gear is of some rather brittle material, when put into a vice it broke into shards like it was an incredibly cheap chrome type steel. Imagine the stuff the free coupon harbor freight 4 piece screwdriver sets are made of, that type of steel... Like you can bend and snap it in 2 or 3 bends.

You might be able to weld it though I have a slightly different idea should you not think it is possible or even a good idea to weld. It's not very good and doesn't stop the gear from working loose again.. I share if no hope. I think the bell sits high enough you could put tacs on it on the side with the main part of the gear, i think the other side (inside the bell) needs to be smooth and flush but I might be wrong.
Thanks for the input. Yeah it just happened today. So really havent had time to ponder what to do to remedy the problem. Welding it did cross my mind. I will look further into it tomorrow see what kind of clearances i have and go from there.
 

Frankenstein

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Jun 24, 2016
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5,078
The steel that the bearing cage (the gear is pressed into) is made of is kinda stupid hard, but not nearly as much as the crank extension, you might be able to hammer around the hole that takes the gear to kind of swage the hole inward? Then press the gear in carefully (line it up with it and put a small piece of wood between gear and hammer, it's really not a robust metal it can break if it gets too much pressure along the sides.)

I can't say for certain if this idea could work but the seat of the groove that takes the gear, hit it lightly with a cut off wheel in a dremel, make a shallow groove in the wall of it, press the gear in that area outward from the inside with it seated, maybe a half inch thick rod with 3 inch strip in the middle ground down except a thin ring in the center of the strip. Put through the gear with a vice holding the metal assembly that takes it but not on the bell itself. Press it in by hand.
Note022118_1.jpg
 

Baconator101

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That is a good idea. One i didnt even think of remotely. I was already working on something. Soo heres what i did. I was planning on drilling out some holes in between the the gear cog, and the bell housing under the bearings. Then screw in some adequate sized screws creating pressure. Then finally once all said and done take my dremel extension and grinding the heads off so as to remain flush so i can then put the bearings back on. So i was just about done with the first hole and the bit broke off perfectly in the groove i had made. Im going to install it, see how quickly it fails.
 

Frankenstein

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That is a good idea. One i didnt even think of remotely. I was already working on something. Soo heres what i did. I was planning on drilling out some holes in between the the gear cog, and the bell housing under the bearings. Then screw in some adequate sized screws creating pressure. Then finally once all said and done take my dremel extension and grinding the heads off so as to remain flush so i can then put the bearings back on. So i was just about done with the first hole and the bit broke off perfectly in the groove i had made. Im going to install it, see how quickly it fails.
I would not, if it falls out it might destroy the rest of the assembly or even move to the big gear and get really torn up. No point in tempting fate, if the gear gets loose and shifts it might mesh wrong and break up maybe even jamming the engine or clutch.
 

Baconator101

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Joined
Apr 2, 2017
Messages
254
I would not, if it falls out it might destroy the rest of the assembly or even move to the big gear and get really torn up. No point in tempting fate, if the gear gets loose and shifts it might mesh wrong and break up maybe even jamming the engine or clutch.
I heeded the advice Frankenstein. The only thing that was easiest without bustin my melon thinking, was taking it to my local muffler shop for it to be welded. Because of that i had to do away with the one way bearing. Installed it today. Will see what kind of longevity i get from the pullstart. Gonna have to throw an extra pull start in my tool bag! Seems to be running well. Havent had a chance to really ride it though. Too cold lately. Will probably make a vid soon.
 

Baconator101

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Apr 2, 2017
Messages
254
Ouch. Well good luck.
The welded gear and bell have been working great. I ordered two more centrifugal clutches,,, now my problem will be how to safely knock thoooose gears loose without damaging them, so i can get them welded in the same fashion. Gonna have to use a socket and mallet!!! Maybe wd40 too!
 
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