Ht 131 Back fire broblem?


New Member
I have an Ht 131 that misfires under load (Nasty popping noise). Tried everything cant seem to fix it. Will only do it under load.

Machine is 3 years old. Not used that much just changed sprocket for first time. Replaced Carb(had a small gasket leak), Removed muffler screen (No carbon build up found), replaced ignition module, checked flywheel gap, new spark plug, inspected wires from trigger for grounding short, vacuum test good, compression test good, and rebuilt clutch, tried adjusting carb. No luck so far

Took machine to local dealer no luck there on a fix so far. Dealer will be contacting Stihl for assistance but no luck so far.

Any Ideas? I am at a loss.

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