How can I keep my Shanghi Jmstar 250cc scooter from stalling?

by Sheila
(Port Orchard, WA)

I recently purchased this Shanghi Jmstar 250cc scooter with only 20 miles on it. It ran great. Now, it stalls - then I can't get it running. Is there a particular manual I can purchase to try to work on it myself?

Any ideas of why it might be doing this? Something I can change? Or is it your opinion I should just get rid of it? Thank you for any and ALL help! When I CAN ride it - it is so much fun! :-)


Comments for How can I keep my Shanghi Jmstar 250cc scooter from stalling?

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Oct 31, 2011
by: momule

With few miles on your scooter it is most likely that it has sat long enough for gas to have evaporated in the carburator leaving the carb jets clogged or the linkage sticky. This is something that you can fix by adding a pint of Sea Foam Gas Additive to your gas tank (follow the directions on the can but a little extra will not hurt). It may be necessary to find the air intake inside the plastic scooter covers, clean or replace the air filter and spray some carb cleaner spray directly into the carb just to keep it running.

This will be your most likely fix and without question will be your cheapest fix even if you have to have it done by a mechanic. Good luck !

Aug 04, 2011
Valve Adjustment
by: Jim Zeiser

It sounds like the clearances on your valves have tightened up. Time to have them adjusted.

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