Improper Fuel, Dirt In Fuel Line, Dirty Debris Screen
No Crankcase Vacuum/Pressure in Crankcase
Crankcase breather clogged or inoperative. Seals and/or gaskets leaking. Loose or improperly torqued fasteners.
Replace valve cover and recheck pressure. Breather is integral part of valve cover and cannot be serviced separately. Replace all worn or damaged seals and gaskets. Make sure all fasteners are tightened securely. Use appropriate torque values and sequences when necessary. Piston blow by or leaky valves (confirm by compression or cylinder leakdown tests and inspecting components). Recondition piston, rings, cylinder bore, valves, and valve guides.
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.