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Generac — 3. 30-100% Cylinder requires repair

A Generac service procedure — check it applies to your exact model before use.

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Procedure

  1. 30-100% Cylinder requires repair
  2. Carburetion
  3. Crankcase vacuum
  4. Ignition timing a. A partially sheared flywheel key will effect ignition timing and engine performance.
  5. Spark plug a. A fouled spark plug may indicate that carburetor is out

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.