Clutch Help

MrFastFox666

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Apr 28, 2021
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Hello everyone, I'm fairly new to this forum so I apologize if this has already been discussed, I couldn't find much of anything. If anyone could either help me or direct me to the relevant thread I'd greatly appreciate it.

I recently built a motorized bike with a kit from Amazon and so far it has worked well, but I think the clutch is worn out already. This is only after about 2 hours of riding max, I haven't even gone through half a fuel tank. Engine is Huasheng 142f with tapered clutch shaft, by the way.

On my last ride I noticed that the engine would vibrate very violently under acceleration, so I stopped riding. I solved this by cleaning the clutch and clutch bell housing. Also, I noted that in general I need to rev up the engine pretty high for the clutch to engage at all, and even at 25mph it isn't fully engaged. After I took off the transmission I noticed there is only about 1-2mm of pad left on either side of the clutch, and there is a huge gap between the bell and the clutch. After some digging I was able to find that it is common for the clutch bell to be oversized, but I can't find any replacements. I did find this clutch: https://www.amazon.com/gp/product/B08XLZ6QDX/ref=ox_sc_act_title_1?smid=A200MF86H5LIR7&psc=1 and was wondering if anyone had any experience with it. Is it any good, and if not, what are people doing to solve this issue?
 
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Actually the tapered shaft clutch is the better engine and gearbox. You have to keep the engine at higher rpm I've heard. Also use the pedals if you aren't doing so. The video covers straight shaft from the looks of it in the video. My clutch is still fine despite the dumb bushing drying out like 4 times. So it could be user related and not part related. Someone else just did a post asking why the whole thing was shaking and too much torque. While its only : Torque: 1.47 lb ft. @4500 rpm.
 
Actually the tapered shaft clutch is the better engine and gearbox. You have to keep the engine at higher rpm I've heard. Also use the pedals if you aren't doing so. The video covers straight shaft from the looks of it in the video. My clutch is still fine despite the dumb bushing drying out like 4 times. So it could be user related and not part related. Someone else just did a post asking why the whole thing was shaking and too much torque. While its only : Torque: 1.47 lb ft. @4500 rpm.
Why is my engine version better? More durable or something? It seemed like the majority of clutches I came across were for keywayed straight shafts. Either way, I do use the pedals to help me start off, but after about 10mph I stop pedaling. Maybe I could change my habits to promote longer life, but I doubt that my riding habits caused it to die after less than two hours. Again, I haven't even gone through half the fuel tank which is ridiculous!

Thanks for the link. However, it seems like they just have the regular 75mm clutch I can find anywhere else. I also didn't see a clutch bell available


Watch this video.

Thanks for the help. That's not the issue I have, though. For me, the problem is that the clutch doesn't engage at lower RPMs, so it always slips. It disengages just fine, though.
 
Sounds like the bicycle either needs more gear reduction or over sprung clutch or too light of clutch weights. If there are even weights on it. What's your top speed?
I feel like more gear reduction would certainly help.

I've only gotten the bike up to maybe 30-33 mph since I only had the weak sauce coaster brake and no wide crank assembly (included one didn't fit), but even at that speed it didn't sound like the clutch engaged completely

Edit: forgot to mention clutch is the 2 leaf type. It doesn't seem to have any weights attached to it
 

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I feel like more gear reduction would certainly help.

I've only gotten the bike up to maybe 30-33 mph since I only had the weak sauce coaster brake and no wide crank assembly (included one didn't fit), but even at that speed it didn't sound like the clutch engaged completely

Edit: forgot to mention clutch is the 2 leaf type. It doesn't seem to have any weights attached to it
Actually the shoes are the weights, maybe those springs are too strong.
 
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