Generac — GENERAC
A Generac service procedure — check it applies to your exact model before use.
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Procedure
- 0-10% Cylinder is good
- 10-30% there may be a problem
- 30-100% Cylinder requires repair
- Carburetion
- Crankcase vacuum
- Ignition timing a. A partially sheared flywheel key will effect ignition timing and engine performance.
- Spark plug a. A fouled spark plug may indicate that carburetor is out of adjustment.
- Leak in spark plug wire
- Head gasket
- Intake manifold a. A leak at either end of the intake manifold will only affect one cylinder, not both.
- Valves
- Rings
Source: manual:0C1103A.pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.