rc car maintenance
RC car question need help please!?

I have a buggy HPI 5b 23cc (2T). Recently, when I start the engine, it just bursts out lots and lots of gray smoke and the torque and speed have dropped massively. throttle is so full, as now quarter. I use the correct fuel oil to 2T and I have done all the routine maintenance according to the user manual. I never changed the settings on the carburetor or the other. It worked fine for a whole spring and summer, never used in all conditions of snow or rain, never is hard to discredit her. Do not know what to do. I am determined to change the whole engine to another, nor anyone knows how to solve this problem or what could be the cause?. pls help! THX

Ensure that fresh fuel and oil, replace the HT lead and spark plug. There should be a section in the manual re-setting the mixture back to factory settings, try that and see how you agree with it. Well course, make sure not to use diesel instead of gasoline at the pump …

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