Re: Engine Spitting Back Through Carbs? How long has the engine been doing this and when did it last run correctly? Will have another look, This is not recommended for shared computers, Back to Problems, Questions and Technical. Throat clearing is a normal response to irritation inside the throat. Don't start at the 'far' end. and when i got it all put back together i went to pull it to start it, it was not drawing fuel into the well, so i thought maybe the gasket was not sealing properly so i … A spark at the cilinder which contactpoint in the distributor cap was nearest to the rotor point. A problem which plaged the 3 cylinder Evinrudes. A sticky or burned exhaust valve can also cause some backfiring out the exhaust. It is jetted like it said and the fuel mixture screw is 3 turns out like the instructions say. Basically, when that plug sparks out of turn, it lights the fuel in the cylinder - and that pressure has to go somewhere... so if the intake valve is open, it goes right back up through the intake manifold and out the carburetor with a "spit" and sometimes even a flame, or it goes out the exhaust and creates that loud BANG. Possible causes … However, they do have a side mounted float bowl like the HS series. If you spit the instant you blip the throttle, then it's probably the accelerator pump in the carb not working, or not squirting enough fuel, so the engine takes a gulp of air and goes lean, which causes the spit back-up through the … Related Articles. Symptom of lean mixture with choke on. Footage taken from Holley Carburetor Installation & Tuning DVD. That's not too uncommon if the carb is a bit old. A great way to check for any cross firing is to park in a dark place at night and open the hood with the engine running. When the cilinder was in its working stroke and the ignition did not come because of lack of contact at the coil, and it comes a little later and the exhaustvalve has openend already, you hear it bark in the exhaust. Remove the float bowl lid and use spray carb cleaner to wash out the gunk in the bottom of the bowl. If the RMA still has original carb fitted it should be SU H4 type. I am suggesting checking the ignition timing which involves using a timing light to illuminate the timing marks on the front pulley. I'd check to make sure all your vacuum lines are hooked up, including the one in the back for the power brakes. An engine backfire is an explosion produced by an internal combustion engine. Next questions. also check condenser & LT wiring esp base plate earth in dizzi, & points condition, if all above is good , then I would check compression , in case valves are leaking / sticking as engine has been stood. Erratic slow running is often caused by air leaks, so verify there are none at the point of attachment to the cylinder or inlet pipe. there is more fuel and less air. agree with what everyone above says The backfiring through the carburetor (the coughing or spitting), on the other hand, frequently happens in the morning when the carb’s air/fuel mixture is too thin. Atv is backfiring through carb.? However, this may not last long, a good one blast on that moment is all that it takes when the engine is totally warmed up. By: Bill Tichenor | 12/02/2009 < Back to Motor Life Home. These engines were originally setup for five star fuel. So... when, and how, it backfires, or spits, will give you an indication for where to start looking so you can fix it. My buddy has a big bear 400 that is spitting back through the carb at idle and just above idle. The ratio of air to fuel in the mixture gets skewed in favour of fuel i.e. Spitting back through the back of the carburettor normally indicates that the mixture is too weak, or the timing is hopelessly retarded. the engine i brought in ran when i brought it and i took it all apart and reassembled it. I'v gone through the lt side but I can't see a fault, doesn't mean there isn't one. Repetitive Back fire. However, if the engine "ran when parked" and you have changed all the ignition parts you listed... don't touch the timing at this point. In a 2 stroke 70H.P Veinrude, the spitting of fuel back through the carb can be caused by excessive fuel - a carb problem- and/or a reed valve problem. Backfiring through the exhaust is a result of problems arising out of rich fuel mixture and out-of-turn sparking of spark plugs. All recently rebuilt. I'll assume that you're talking about popping out the exhaust pipe. A backfire results in a temporary loss of power and forward motion along with a … If its still giving trouble, you might need to give the carb a good cleaning, which mostly sucks so because I'm lazy I'd try to run some barryman's b12 through it … Spitting actually begins when a spark is out of turn, which creates pressure from the burned fuel. I richened the carb by one flat on the carburetor just out of interest and it did improve the running but I haven't got a gas analyzer and I don't want to guess the mixture. If you haven't messed with your timing though, then this is probably not your problem. A cold engine needs more fuel to run, and a warmer engine runs more efficiently and needs less fuel, so if you are only spitting when the engine is cold, then most likely it's due to a lean condition. For instance the connection at the coil. Toward the back of your throat, on both sides, you'll see your tonsils—almond-shaped structures behind your back teeth. The carburetor must be clean, as fuel cannot flow properly through a dirty carburetor. This is a result of working equipment, and is unlikely to cause damage. What has been done to the car/engine since the engine last ran correctly? Find out why you’re producing excess mucus and what it … And right in front of them, there's a … "Backfiring" is usually caused by a spark plug "sparking" when it isn't its turn and the exhaust valve is open. This can also happen if one of the plug wires isn't in the right spot within the firing order on the distributor cap, or down at the spark plugs themselves. It causes a misfire very similar to that of a cracked distributor cap. Do you mean that without the air cleaner on you can actually see fuel vapor coming out of the carb intake or do you mean that the engine is backfiring through the carb when you rev it? If the problem persists after that, look for a lean fuel condition. As Doug suggests, a good clean-up of the petrol pipes and carb could be first move. 15 Possible Causes For Excess Saliva Production ... as a result, cause excess saliva. When this happens while the exhaust valve is open, it will ignite the rich / unburned mixture inside the exhaust manifold (and tail pipes) and result in a big bang. The ignition system works bij interrupting the primary current. When you hear a backfire, you need to determine whether it is backfiring out the exhaust or back up through the carb. That will prevent fuel flow and will cause a lean condition. Having timing that is too late (retarded) can cause this same thing sometimes if your engine is running too rich.
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