![]() Intake Valve Stuck Open (Myriad of Reasons).Timing Issues (Sparkplug/Ignition Coil, etc.). ![]() What Causes Backfire Through the Carburetorīackfire through the carburetor can be categorized into one of 3 broad issues (or a combination of them): In this article I’m going to talk about what causes backfire and afterfire in a generator, if they can damage your engine, and how to fix them. Afterfire occurs through the generator’s exhaust and is due to a lean or rich air-fuel mix, a timing issue (late combustion), or a stuck exhaust valve. Generators backfire from the carburetor due to a lean air-fuel mix, a timing issue (early combustion), or a stuck intake valve. There’s actually a difference between true “backfire”, which is when your you hear pops or see flames from the carburetor, and then there’s “afterfire” which is when your exhaust makes a pop or flame through the exhaust itself. Most people when they experience any of these symptoms will simply say that they are experiencing “backfire”. You definitely know something is wrong with your generator when you hear loud pops and maybe even flames or smoke coming from your exhaust or your carburetor.
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