This unit had 1500 hours. This can be from too much fuel, running rich and just too much fuel to burn inside the cylinder. My thought is to spray carb cleaner 'in through the out door' while rotating the knob through on and reserve. Re: exhaust - I'm wondering if the 10 min to backfire delay is the time it takes for something to heat up, expand, and leak. Portable standby generator troubleshooting and repair questions. by Alex Saez . I called the carb place that rebuilt it and they said it must be an electrical or iginition problem as a backfiring problem is 99% electircal. Engine backfires may sometimes occur if the pump is unable to squirt in enough fuel in time. Tuned up, (new plug, carb rebuilt and swapped, valve lash adjusted). It will backfire a couple times on startup, but clear up and run no problem. Jul 13, 2015 #2 I would … Anyway in the last few months it backfires through the carbs alot at or just above idle speed. Be careful not to make it any bigger. Joined Jul 21, 2013 Threads 10 Messages 895. It starts really easily but does not get to full speed (there is no idle setting). I noticed someone mentioned holes in the rubber carb boots. I would like to hear from others if they have changed it to solve the problem. I've got a car that was sitting for a year and a half. Generator Backfires. If it's too far retarded you can get backfiring through the carb. IT Stock Free/Polka Dot/Getty Images . We got it running but bad fuel had the carb all gummed up. Source(s): https://shrinkurl.im/a8mIK. Generator backfire out of carb. M. Mikel1 Well-Known Member. This may be because the pump is plugged up or simply not working. I have a generator with a Tecumseh HM100 engine. It seems to do it worse when its cold. Timing was set to 10 initial. Try a new plug. Backfire through Carb. Bought it used so I don't know the history. 0 0. Edd S. Lv 5. JohnDizzy Member. Back in Dec I had the carb cleaned and adjusted by a bike shop. May as well replace them if you haven't done so recently, as it's only a couple bucks. My Kawasaki Mower Engine Backfires When Starting. When I got it it had sat for several years. When it does it shoots fire back through the carb. On the older engines with points I would see a condenser going out, or be loose on the connections and cause backfiring; but you don't see those old points and condenser units much any more. 1; 2; Next ... Use carb cleaner and compressed air to clean the jets and then blow cleaner and air through all the ports in the carb itself. Still does it same as always. One would think that the rocker to valve clearance would be greater. Had all the symptoms listed above/below. That backfiring through the carb could be an intake valve intermittently sticking. Hi folks, I'm having an issue with my home generator surging and pulsing. Every engine component plays a key role in your car's function, and the intake system is no exception. 1 Posts #12 • May 27, 2018. Should compressed air blow freely there? (Gasoline, diesel, propane, natural gas) 4 posts • Page 1 of 1. rockycmt New Member Posts: 1 Joined: Mon Aug 10, 2020 8:28 pm. Have a GCV160 on a rototiller. Yea, coughing through the carb & popping through the exhaust 2 different things. Issue was the generator wouldn't start and was backfiring through the carb. backfire in the exhaust is fuel-air mix getting through the engine unburned or not fully burned and it is just burning as it is vented into the exhaust. A generator will backfire after being turned off due to continued momentum of the piston for a few moments after being shut off. 1 turn out on all 4 seems to give the best response. The ignition is an aftermarket Chevy style HEI distributor with the ford bottom. Thread starter rmeche; Start date Dec 8, 2007; R. rmeche Registered. will the car run or just backfire through the carb? Generator runs great until I turn the AC or any other heavy load on. if it's been out, it may be 180 out, that will back fire be sure the number one wire has the rotor pointed to it on top dead center of number one cylinder if it backfires through the carb one of your intake valves is open during igniton on one of the cylinders if the distributor has not been taken out it may be to far advanced . The backfire is one poof through the carb, not repetitively like a worn cam lobe. I just repaired my honda eu3000is. I will continue sloshing fuel/carb cleaner around and shaking it out. All recently rebuilt. When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. An air-fuel mix will momentarily be pumped through the combustion chamber and into the hot exhaust manifold where it will spontaneously combust with a loud bang. I bought this unit used about three years ago with a dirty carb. SBC 283 with 4 Holley 94. . Like the other poster mine backfires so bad when it's cold that my diaphram in the carb is damaged also. He said that he just went through the carb and cleaned it all out. A backfire can be caused by events such as shutting down the engine Briggs and stratton backfires through carb Briggs and stratton backfires through carb Air that enters the combustion chamber without passing through the carburettor is un-metered. Messages: 18 Likes Received: 18. We use cookies to give you the best possible experience on our website. First thing that came to mind was a partially sheared flywheel key, causing the engine to be a little out of time. Also check your base timing. Onan CCK backfiring through carb. Onan Generators . By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I didn't check for this but did not see anything when I took off the carbs. As soon as the A/C or load is turned on it will cug, spit, and backfire and run like absolute*****immediatley. There are no mods on this bike. 8 years ago. Thread starter Jstinson; Start date Jul 13, 2015; J. Jstinson Forum Newbie. backfire / backfires. I took off the carbs and cleaned them out with no change. can any body help me with this problem.it is also vey hard to start. The hole in the idle jet is very small, you may need to find a small piece of wire to poke through it to get it clean. I have a generac 7500E Portable generator having some engine issues. Tank did/does have crud in it. Jul 13, 2015 #1 I have a cub cadet with a Kohler engine it is back firing through carb any and all help will be appreciated thanks jeff . There is no carb adjustment. Vacuum advance pulls another 15 or so, on the manifold. First is the condition and gap of your points. So, as the backfire was coming through the carb I decide to look at the valves, after removing the rocker cover I noticed that the inlet valve rocker was extremely loose and only just operating the valve. Post Mon Aug 10, 2020 8:39 pm. A Kawasaki lawnmower engine that backfires on start-up has a problem with fuel delivery through the idle jet. Drain or add water remover to the fuel and a little bit of degummer/carb cleaner. Most backfires through the carburetor arise as a result of faults within the ignition system. It is not fuel or carburation. i back fires through carb when tring to start. 225 Posts . That backfiring through the carb could be an intake valve intermittently sticking. May be because the pump is plugged up or simply not working backfires, this an! And cleaned the plugs, along with the wires, distrib cap, etc ignition is an aftermarket Chevy HEI... 2 weeks my 03 600 has been popping/backfiring back through the carb cleaned. 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