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wont start?

350 husqu. has spark ,fresh fuel reaches plug.how do I recheck & set timing. or your suggestion why wont start.
Bernard, April 2010
Timing is set by the flywheel key, the air gap between the ignition unit and flywheel is 0.3mm, i think you should remove the two allen screws holding the muffler on, remove it and check the condition of the piston through the open exhaust port, any visual damage and the machine will need to come apart as it will never start.

Husqvarna man, April 2010