Re: MF 135 popping under load

Posted by Steve@Advance on June 17, 2017 at 20:31:12 from (66.169.147.211):

In Reply to: MF 135 popping under load posted by mercomet on June 17, 2017 at 20:22:15:

Is this a steady popping, back through the carb under load?
That is a sign of an exhaust valve not opening, flat cam, bent pushrod, etc.

Or a one time, random pop back through the carb?
That can be retarded ignition timing, lean mixture.

Exhaust pop can be a vacuum leak, erratic spark sending unburned fuel to the exhaust.

If a partial choke makes it better, try opening the main jet a little. It should take full throttle from idle without hesitation, a single puff of black smoke is desirable.

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