CAUSES OF BACKFIRE/AFTERFIRE IN A GENERATOR

What causes a small engine backfire & how do I fix it?

Backfire typically occurs when the engine is decelerated rapidly.
Common Causes of Backfire:
*.Lowering engine speed too fast
*.Gasoline, which contains higher blends of alcohol
*.Carburetor adjustment set too lean
*.Muffler construction can induce backfire
*.Higher than normal engine temperatures
*.Some carburetors can induce backfire due to the sensitivity of internal transitional passages
*bad plug
(This condition cannot be corrected).
Possible Fixes for Backfiring:

*.Lower engine speed slowly
*.Follow small engine fuel recommendationsand/or switch to brands with low or no alcohol
*.Adjust carburetor for optimum performance
*.Inquire with equipment manufacturer about increasing air volume to decrease engine temperature
*change plug to a new one

What causes a small engine afterfire & how do I fix it?

Afterfire occurs after the engine has been shut off.
Common Causes of Afterfire:
*.Shutting off the engine at high RPM, causing fuel to pump through the engine for ignition
*.Gasoline that contains alcohol has a tendency to ignite easier, which can cause afterfire
*.Small engine muffler type and manufacture
*.Carburetor adjustment may not be properly set for correct engine performance
*.Anti-afterfire solenoid may not be working properly
Possible Fixes for Afterfire:
*.Allow the engine to cool by idling the engine down with proper speed (15-30 seconds)
*.Change to a different non-alcohol or alcohol brand fuel
*.Ensure proper carburetor adjustment for optimal engine performance
*.Contact the equipment manufacturer for updated designs in air control baffling, mufflers, etc.
*.Check the anti-afterfire solenoid for proper operation
Note: If equipped with an anti-afterfire solenoid, shut engine off at full throttle

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