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