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Bubbling gurgling sound in engine after it warms up. Drained and flushed radiator and oil. Both normal no discoloration. Engine also cracks back at full throttle. Any suggestions or thoughts?
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Sounds like the radiator is not holding pressure. Try replacing the radiator cap first.
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It's holding good and snug, never had any problems with it. Doesn't leak or anything like that.
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Richard Mallette “Engine also cracks back” could be a timing issue as well as a fuel delivery issue. The “Bubbling gurgling sound “ could be caused by air in the coolant system. You did not tell us if this all just started or if this has been going on for a while.
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Just started yesterday
And is 49cc single cylinder
The coolant was kind of low when I dumped it and replaced it, but how do I purge it if air did get into the system?
Richard Mallette what is the exact model number for your scooter
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