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what would cause a 150cc scooter to lose power?
NO it would not.
No
You may need rotors
A defective catalytic converter can do that.
a vac leak
change the fuel filter
the shaft inside the tranny is broke.
if you have a carborator, it may have to be adjusted
If the car has high miles, try checking the catalytic converter. If it is clogged it will cause the vehicle to lose power.
Vapor lock!
Pressure test the convertor.