Is the little engine on your lawn mower, eye blower or the end power tools making according to noises? This FAQ indigenous Briggs & Stratton will assist you identify the problem and also find solutions.

You are watching: Briggs and stratton engine backfires through carb


Backfire is a problem described together a loud bang, poof, explosion, etc., if the engine is to run or when shutting down. Afterfire occurs after the engine has actually been shut off. Note: Backfire and also afterfire v the carburetor will not damage the engine at all!

Find the end the most common causes and possible fixes because that engine backfire and afterfire.

Causes of tiny Engine Backfire & possible Fixes causes of tiny Engine Afterfire & possible Fixes


Backfire generally occurs when the engine is decelerated rapidly.Common causes of Backfire:

Lowering engine rate too fastGasoline, which contains higher blends the alcoholCarburetor adjustment collection too leanMuffler building can induce backfireHigher than typical engine temperaturesSome carburetors deserve to induce backfire due to the sensitivity of interior transitional passages (This condition cannot be corrected).

Possible Fixes because that Backfiring:

Lower engine rate slowlyAdjust carburetor because that optimum performanceInquire with devices manufacturer about increasing waiting volume to decrease engine temperature

Afterfire occurs after the engine has actually been close up door off.Common reasons of Afterfire:

Shutting off the engine in ~ high RPM, resulting in fuel come pump with the engine for ignitionGasoline that contains alcohol has actually a propensity to ignite easier, i m sorry can reason afterfireSmall engine muffler kind and manufactureCarburetor adjustment may not it is in properly collection for correct engine performanceAnti-afterfire solenoid may not be working properly

Possible Fixes for Afterfire:

Allow the engine come cool by idling the engine under with ideal speed (15-30 seconds)Change to a various non-alcohol or alcohol brand fuelEnsure ideal carburetor adjustment because that optimal engine performanceContact the equipment manufacturer because that updated design in air manage baffling, mufflers, etc.Check the anti-afterfire solenoid for suitable operation Note: If equipped through an anti-afterfire solenoid, close up door engine off at full throttle

In any event, your best resource of details would it is in to above your regional Briggs & Stratton company dealer.

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