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Re: Why won't it run?
If the carburetor is ok, check the fuel pump. If it had bad gas in it, the tiny diaphragm gaskets within the fuel pump might be gummed up a little. You can check the pump volume if you remove the fuel line from your carb, aim it into a bucket or other receptical, and watch it pump. The gas should pulse smoothly with a little force. I'm not sure how to describe it, but it should be more than just a trickle, in other works. If your pump seems to be doing ok, and all of your fuel lines are clean and clear, the problem may be an intake manifold gasket leak, a carburetor mount gasket leak, or the intake manifold itself may be leaking. The intake manifold is two-piece, pressed aluminum with a sealant in between the two pieces. A leak at any of the three locations I mentioned would cause the problems you're experiencing. The fuel would of course reach the carb, but due to the any leaks, the vacuum needed would be decreased to the point that it wouldn't be enough to draw the fuel through the carb.
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Is this a carbed engine, that usually means mechanical fuel pump? Take fuel line loose from carb, aim into container, crank engine, does gas flow? If so, have to check float bowl in carb to see if any gas, if no gas, need a carb kit in my opinion.
I don't know liter size of engine? If fuel injected, let us know.
Well if the pump works then follow the pump fuel lines to the engine,you will find the fuel filter then replace it and will also see petrol if any in it ,if not pump isent working ,if dirty replace it and blow air back from carby to filter to clean out pipe
,turn on ign fuel should come to filter and then with new filter in turn on fuel and see if any comes to carby if ok it should start and run.
Have a goodday,
Fuel pump is not running (if electric) or floats stuck. Outside of those, hole in fuel line, possibly even line in tank. My old one had a sight glass on the float bowl where you could see if fuel was in it.
starving for fuel. first check for bad/old gas, then restrictions in the fuel delivery including fuel line, filter, or buildup of debris in tank or any sharp bends or 90deg. fittings. then pull the float bowl and make sure the float is regulating fuel fuel into the bowl, but most likely your main jet is plugged. use a fine piece of wire like guitar string to runthru the jet located at the lowest part of the carb that hangs down into the float bowl. the jet will be on the side or bottom of this lower piece. put bowl back on, get gas to the carb and recheck starting problem. good luck. R
There could well be a build up of sediment and debris in the main jet to the carburetor. It is easy to get to and clean. It is the brass bolt that holds the lower float bowl onto the main body of the carburetor. To clean it, drain your gas. Remove the bolt and external washer UNDER the carburetor bowl. Clean out the bowl of any sediment and/or water. To clean the brass bolt, use no metal objects. Carb/Choke aerosol spray cleaner will do the job. Pay close attention to the hole in the bottom of the bolt and the very small holes about 2/3 of the way up the bolt. Clean till shiny with holes cleared and reinstall. Your fuel flow problem and shut off condition may be solved.
Fuel restriction, undo the drain screws in the lower of each carb float bowl, allow old fuel to drain out, it may be the float needles are stuck thus preventing the fuel from flowing freely into the carbs, check fuel flows from fuel tap removing the fuel pipe and turning the tap to prime position will allow fuel out of the tank without the need to run the engine. It may be you have to remove the carbs for overall including cleaning all the jets etc. Hope this helps,
The carb is probably plugged up with 'varnish' that occurs if the gas sat in the carb too long. Try letting some carb cleaner sit in it over night. It may end up having to be pulled apart to clean it throughly. Always use 'stable' in your gas and if you don't run for extended periods, let it run all the gas out until it stops running. That way the carb is empty.
I had similar problem and cleaned the spark plug and that seemed to have worked, but I think that may be a temporary fix because the engine still seems to be running unevenly. I feel that it must be a larger problem with the carb. If anyone can help this novice to adjust the carb or clean both carb and filter, or offer other solutions I would appreciate your assistance.
Lets start with the basics. Is the gas valve turned on? Do you have plenty of gas in the tank. If not, turn the gas valve to the "reserve" position if your valve has a reserve setting. There may be a water trap bowl at the base of the gas valve. Turn the valve off and remove the bowl if you have one and then clean and replace it.
Next, drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine.
If the bike doesn't start after a couple of minutes then shut off the gas and remove the carburetor.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray all the little airways and fittings in the carb. Remove the two screws on the outside of the carb and spray into the screw holes as well.
Be sure to put each screw back in the hole it came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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