Keep stalling [PLEASE HELP!!]


New Member
Nov 8, 2016
omg I'm so frustrated. I don't know what causes this problem.

Please help.

I have 4 stroke 49cc centrifugal clutch friction drive bike. REALLY SIMPLE.

1. Bike behaves perfectly normal for about 10~20 min of riding.

2. After awhile (10~20mins later), the clutch does not disengage when I let go the throttle and when I come to a stop, the engine stalls.

3. Can't restart the engine because bike is stopped (as soon as engine starts, it stalls) I can only get it started when the bike is lifted so the rear wheel can move.

4. I have diagnosed that at idle speed, the roller is still spinning.

5. when engine is cooled off about 2~3 hours, it behaves normally again.
The clutch disengages when I let go the throttle and everything.

It almost feels like this bike is possessed


Solutions i have received so far

1. Check the throttle cable.

This didn't work because it behaves normally for first 15~20 mins.

2. lubricate the clutch


3. adjust clutch spring

Last edited:

Venice Motor Bikes

Custom Builder / Dealer/Los Angeles
Mar 20, 2008
Los Angeles, CA.
It sounds like the clutch might be installed incorrectly...

Take it apart while it's still warm & try to see if you can spot why it's not disengaging at idle.