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Generac — SECTION 1: GENERAL INFORMATION

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

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Procedure

  1. Carburetion
  2. Crankcase vacuum
  3. ignition timing a. Apartially sheared flywheel key will effect ignition timing and engine performance. If the RPM loss is greater than 75 RPM this indicates that the cylinder with the least RPM loss is the weakest of the two cylin- ders. Look to that cylinder for a problem.
  4. Spark plug a. A fouled spark plug may indicate that carburetor is out of adjustment.
  5. Leak in spark plug wire
  6. Head gasket
  7. Intake manifold a. Aleak at either end of the intake manifold will only affect one cylinder, not both.
  8. Valves
  9. Rings
  10. Piston
  11. Cylinder The cylinder balance test will also detect a cylinder that is not functioning. When grounding out one cylinder there will be no RPM loss. When the other cylinder is grounded out the engine will stop. NOTE: A twin cylinder engine will run well on one cylin- der as long as the power required for the application does not exceed the power produced by the one cylinder.

Source: manual:0C8221.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.