I have a Craftsman riding mower with a Briggs and Stratton 17.5 HP engine. Everything looks good. The problem can usually be traced to the carburetor or distributor. There is no carb adjustment. Generator Backfires. backfire is a result of half burned, hot exhaust finding oxygen to finish burning. Only one direction is all that should be allowed. Verify consistent spark with timing light/spark tester with engine under load. I'd change the spark plug first. I'm guessing its also hard to start or does it just do this when the engine has been running? Sep 10, 2016 #2 - Craftsman Riding Mower Check out the video on how to fix and engine backfire. If it backfiring through the exhaust I would have to say chances are your getting enough fuel (quite possibly too much). ... Hi, this is regarding a Dewalt/Honda DG6000 gasoline generator, low hours, uses a honda GX370 engine with a float carb with a fuel shutoff solenoid at base of float bowl. It is fed gasoline through the side of the stem that the carburetor bowl fastens to and on the stem is a tiny little black dot which is the second jet and is made of plastic. The extra oxygen may come through a leak in the exhaust manifold gasket, an exhaust pipe sealing ring, or a damaged pipe. Engine backfires through the carb when trying to start. I have a generator with a Tecumseh HM100 engine. But it turned out to be not enough gap on the exhaust. In today’s society, where green energy has become so popular, more attention has been placed on the issue of dealing properly with exhaust fumes.. Venting your generators exhaust, therefore, becomes a task you want to embark upon. The electric fuel shutoff is bad when tested. In making use of a generator, one of the biggest challenges one might face is with the exhaust. If air is allowed in both directions the valve is bad and should be replaced. I have replaced carb, cleaned tank, replaced fuel filter, checked valves, push rods, and pulled flywheel to see if the key was sheared. Share this post. Most engines have one or two of these valves one for each exhaust manifold. Source(s): https://shrinkurl.im/a8mIK. I just repaired my honda eu3000is. You would think the lash was too great of a gap. It surges high and low and backfires through the muffler, cold or hot. It was caused by the valve lash. Backfiring can cause serious damage to an engine if the problem is not quickly fixed. VI. As oxygen content increases, it causes partially burn or unburned fuel entering the system to ignite loudly. Issue was the generator wouldn't start and was backfiring through the carb. If it has sat idle for a long period of time the gas is weak plus you might have reach water in the tank. Exhaust backfires can also be the result of air leaks in the system. The motor is backfiring out of the carb and exhaust is spitting flame the carb is spitting gas out of it, and I'm at a complete loss please help as this is my only transportation to and from work! Nov 28, 2012 1,389 830 113 sf bay area. To check these valves you must remove them and then try to blow through them each way. Any suggestions as to what could be wrong. Tony01 Well-Known Member. 0 0. Edd S. Lv 5. Bought it used so I don't know the history. It starts really easily but does not get to full speed (there is no idle setting). One would think that the rocker to valve clearance would be greater. Drain or add water remover to the fuel and a little bit of degummer/carb cleaner. Does not retract when voltage applied. Exhaust System Leaks. Still a little weak when the generator is loaded, but no surging and very little backfiring! My hunch is plugs/plug gap/wires. Troubleshooting a Backfiring Exhaust on a 350 Cubic Engine by John Stevens J.D. It backfires through the exhaust. 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