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Motorized Bicycle Trouble Shooting Use this area to post problems that may arise, if you could use some help in figuring out what is wrong with your engine and what needs to be done to achieve top performance.

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Old 01-07-2017, 05:18 PM
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Default Centrifugal clutch issue?

I bought a motorized bike for $50 and I knew it had some problems but it looked cool to fool with. Never had a motorize bike so I'm just winging it.

I have a 4 stroke 49cc Chinese Honda knock off motor. Centrifugal clutch.

Problem is I don't know how the clutch should be working? I can idle the motor and the bike will push a little bit forward. I can stand it up against something and the bike won't move by it's self. Should that be happening or should I not feel any push at all from the engine at idle? The brass bushing was seized in the clutch bell when I got the bike so I banged it out, polished it, greased it and reinstalled. With the belt off I can idle the engine and hold the clutch bell stationary.

Not sure if I need a new bushing or that's how these clutches work?

BTW this bike needed some help. Fuel line was shot and leaked, kill switch didn't work because the on/off switch didn't work so I bypassed the switch. Went to set the idle and the top of the nylon screw came off and to finish it off I had a pedal fall off when I was riding the bike. No idea if there was a nut on the pedal or it some how fell off while I was riding it. LOL. I think the pedal was just hammered on.
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Old 01-07-2017, 11:12 PM
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Otero Otero is offline
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Talking Re: Centrifugal clutch issue?

Ya get what ya pay for I guess. Keep an eye out for someone with $50 whose
looking for something to tinker with. Take it from me, you can spend a lot of
money on junk bike stuff trying to make a junk kit work, or you can spend a lot
on a quality setup & be glad you did. Get a G.E.B.E. kit & a Tanaka engine.
Read & follow the instructions to the letter. Don't assume because it looks simple.




Last edited by Otero; 01-07-2017 at 11:21 PM.
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Old 01-08-2017, 10:58 AM
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Default Re: Centrifugal clutch issue?

If it wants to pull forward without throttle, it may be that the idle is too high. That's a smoking deal for a bike with a 49cc hs.
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Old 01-08-2017, 11:08 AM
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Otero Otero is offline
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Default Re: Centrifugal clutch issue?

Yeah, if the bike's any good. Couldn't give me another HS. A Tanaka costs a lot more,
but they have a 7 year warranty for non-commercial use, a greater range of RPM, and
far fewer moving parts to go south. A 40cc Tanaka will out perform a 49cc HS any
day of the week. I just bought a second one. I've been riding the 1st for more than
5 years, and it still performs better than the day I took it out of the box. They just
keep getting stronger as they break in. (I have replaced the clutch once)

Last edited by Otero; 01-08-2017 at 11:27 AM.
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Old 01-08-2017, 11:10 AM
KCvale KCvale is offline
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Default Re: Centrifugal clutch issue?

Easy fix, it probably has a 7G crap transfer case from gabike on it.
A real skyhawk 4G will fix that.

But for $50 I suspect a lot more problems will follow, especially the engine mount base to the bike.
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Old 01-08-2017, 04:26 PM
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Default Re: Centrifugal clutch issue?

Quote:
Originally Posted by Agreen View Post
If it wants to pull forward without throttle, it may be that the idle is too high. That's a smoking deal for a bike with a 49cc hs.
I played with the idle and have it about as low as I can. The bike will idle and stay in place f I lean it on a tree or something like that. Give a little more gas and off it tries to go. It's not really a problem I just wanted to know if the clutch is working how it supposed to. When I polished up the brass bushing I may have gotten uneven so the bell may be tilted a little. Rode the bike for about 2 miles today.
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Old 01-08-2017, 04:49 PM
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Default Re: Centrifugal clutch issue?

Quote:
Originally Posted by KCvale View Post
Easy fix, it probably has a 7G crap transfer case from gabike on it.
A real skyhawk 4G will fix that.

But for $50 I suspect a lot more problems will follow, especially the engine mount base to the bike.
Bike in question.
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Old 01-08-2017, 05:32 PM
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Default Re: Centrifugal clutch issue?

Just a guess, but I'd say your clutch bell is out of round, or, remote possibility,
weak clutch springs? KC's the expert on chain drives, I'm more into actual pedal
assist with a belt drive.

Last edited by Otero; 01-08-2017 at 05:40 PM.
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Old 01-08-2017, 06:22 PM
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Default Re: Centrifugal clutch issue?

I would have bought the bike just as a challenge...all day!! Check out 'gas bike'(advertised). They have parts for that transfer case. Maybe a new clutch bell and bushing. My lil hs142 is sitting on the shelf since being replaced by a Bigger engine. Swap front ends with that other bike in the pic, softer ride And front Brakes! TLC that baby back to life. Great learner deal.

Last edited by scratchbuilder; 01-08-2017 at 06:25 PM. Reason: add thought
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Old 01-08-2017, 06:43 PM
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Default Re: Centrifugal clutch issue?

Quote:
Originally Posted by scratchbuilder View Post
I would have bought the bike just as a challenge...all day!!

Swap front ends with that other bike in the pic, softer ride And front Brakes! TLC that baby back to life. Great learner deal.
A guy who thinks like me. LOL. If I get it all running right I'll probably find a donor bike in a thrift shop or somewhere to swap out some parts. A front brake and some suspension would be nice.
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