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