Why won't my Lance 150cc scooter run after a recent valve adjustment?

by Anonymous

My Lance 150cc scooter ran great after a valve adjustment, and then after riding it about 150 miles in two days time it started to sputter/stall in tiny little increments while at top speed. Then when I was almost home after a long ride, it felt really hot and started to lose major power and kept stalling at stop lights.

By the time I got it home, it would not even start at all... a couple days later I could start it if given a lot of throttle, but it wouldn't stay on, you would have to rev the engine pretty high to keep it running, and even after warmed up it would still die.... Not sure what to do? Any help... thanks

Comments for Why won't my Lance 150cc scooter run after a recent valve adjustment?

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Apr 25, 2011
by: Jim Zeiser

I would go back and recheck the valves. It sounds like one has tightened up and you're losing compression. I always spin the motor after I adjust the valves and recheck my settings. Sometimes you aren't at the right spot on the cam and the adjustment isn't correct. I've done it myself and had to readjust.

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