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Air in fuel line or fuel line clogged. Exhaust air or fuel line.
Readjust.
Fuel valve is clogged up.
Clear away.
exhaust pipe.
Clear away.
Air cleaner is clogged up.
Intake pipe is leaking. Repair or replace.
Piston or cylinder or piston ring is worn. Replace.
Replace cylinder gasket
clearance.
Readjust.
Valve tightness. Repair.
decreases and stops running.