Briggs 16.5 twin cylinder starving for gas / backfires
agletdave
11 years ago
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I have a White/MTD w/ a Briggs 16.5 HP 42A707 (420000) OHV twin cylinder low emission that slowly began backfiring on shutdown, and now pulses unless I pull the choke partially. Plugs are burning very lean. I changed the fuel, the fuel filter, and a cracked fuel line. Tried pouring Gumout directly into carb. Oil has always been changed - no oil filter on this model. Air filter is clean. Really gets rough at lower speed, almost won't run, but does sputter at full throttle. Never used to do this, shutdown backfiring seemed to start last summer, now getting worse. Does this sound more like a plugged carb jet / main jet? or a valve clearance issue? Not sure if this model has a fuel pump - the carb inlet is higher than the bottom of the fuel tank. There is a small rectangular box on the face of the carb - pump?? I maintain the thing well. Dave
agletdaveOriginal Author
agletdaveOriginal Author
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