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