Why Does My Engine's RPM Seem To Fluctuate (Runs Rough)?

• Engine hunting and surging at idle is usually caused by a fuel delivery, air leak, or governor system problem. Cleaning/overhauling the carburetor, adjustment of the governor, and/or changing the air filter may be required.
• If you wish to perform this maintenance yourself, a good source for engine specifications and technical servicing information would be a Vanguard Repair Manual.
• The correct Repair Manual for your model engine is often listed in your engine's Illustrated Parts List.
• Repair Manuals are available for purchase from a Vanguard authorized dealer.
• Your Illustrated Parts List will also provide component part numbers specific to your engine's Model, Type, and Code that you may require.

   

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