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Diagnosis Chart

Slow, Unstable Idle, Engine Rolling, Frequent Stalling, Breather Backflow, Oily Engine Compartment. 

  1. Valve completely plugged, or stuck in engine "off" position.
  2. Valve stuck in backfire (open or engine off) position.

    Engine Operation Good, But Breather Backflow At Heavy Throttle, Only Engine Compartment. 

    Valve stuck in idle (closed) position.

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