Source(s): https://shrinkurl.im/a8mIK. As oxygen content increases, it causes partially burn or unburned fuel entering the system to ignite loudly. But it turned out to be not enough gap on the exhaust. It starts really easily but does not get to full speed (there is no idle setting). Tony01 Well-Known Member. This unit had 1500 hours. The problem can usually be traced to the carburetor or distributor. ... was removed, it was reinserted. I have a Craftsman riding mower with a Briggs and Stratton 17.5 HP engine. Exhaust backfires can also be the result of air leaks in the system. Verify consistent spark with timing light/spark tester with engine under load. Exhaust System Leaks. It surges high and low and backfires through the muffler, cold or hot. To check these valves you must remove them and then try to blow through them each way. 0 0. If air is allowed in both directions the valve is bad and should be replaced. - Craftsman Riding Mower In making use of a generator, one of the biggest challenges one might face is with the exhaust. Any suggestions as to what could be wrong. It was caused by the valve lash. I have replaced carb, cleaned tank, replaced fuel filter, checked valves, push rods, and pulled flywheel to see if the key was sheared. I just repaired my honda eu3000is. I'm guessing its also hard to start or does it just do this when the engine has been running? Troubleshooting a Backfiring Exhaust on a 350 Cubic Engine by John Stevens J.D. ... 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. Backfiring can cause serious damage to an engine if the problem is not quickly fixed. I have a generator with a Tecumseh HM100 engine. Bought it used so I don't know the history. Nov 28, 2012 1,389 830 113 sf bay area. Sep 10, 2016 #2 Drain or add water remover to the fuel and a little bit of degummer/carb cleaner. If it backfiring through the exhaust I would have to say chances are your getting enough fuel (quite possibly too much). 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! Most engines have one or two of these valves one for each exhaust manifold. Check out the video on how to fix and engine backfire. Issue was the generator wouldn't start and was backfiring through the carb. There is no carb adjustment. backfire is a result of half burned, hot exhaust finding oxygen to finish burning. Share this post. Link to post Does not retract when voltage applied. VI. One would think that the rocker to valve clearance would be greater. The electric fuel shutoff is bad when tested. Everything looks good. Still a little weak when the generator is loaded, but no surging and very little backfiring! I'd change the spark plug first. The extra oxygen may come through a leak in the exhaust manifold gasket, an exhaust pipe sealing ring, or a damaged pipe. My hunch is plugs/plug gap/wires. If it has sat idle for a long period of time the gas is weak plus you might have reach water in the tank. Engine backfires through the carb when trying to start. 8 years ago. 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. It backfires through the exhaust. Edd S. Lv 5. 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. You would think the lash was too great of a gap. 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