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Re: bike is stalling
Your going to have to determine if its an electrical problem or a fuel problem. Could be bad plugs a loose wire, misadjusted carb or contaminated fuel or a pluged fuel line. and actually a few other things including a bad piton ring. I would start with the cheap and easy stuff. Drain the fuel tank, clean the fuel filter......see if that helps
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check for the pinched vacuum line at the carb,, sportys are hard to locate because they are tucked in way behind , it ay have come disconnected, unless there is a load on the motor it will idle fine, add a little load and you get the feeling no fuel is getting through unless you rev it up
there is usually a screen in the fuel ****/valve that will catch any nasty goop that may have been in the tank. Also there might be a screen before or right after the fuel pump. you need to eyeball these to see if they are stopped up. good luck
Could be a fuel line restriction, bad petcock, problem with the vacuum line to the petcock if this is a carburated engine. Could be something as simple as a bad gas cap. Try loosening the gas cap just a bit and ride to see if does it then. Loosen the right side tank cap.
If it's fuel infected, I'm sorry but I can't help you.
It sounds like you probably need to replace the fuel filter, or you may have alot of trash in the bottom of your gas tank, possibly even water in the gas. If you can, take the tank off and clean it out well, making note if there is any trash in it, by emptying it into a bucket so you can examine it. Go ahead and replace the filter if you find any trash or water in the gas tank. If it is ok, then the next thing would be to check the fuel line for aging. Sometimes in rare cases, the hose gets old and weak and when you try to pull fuel through it, it can collapse and essential stop the gas flow, just as if you have turned the gas off, then when the suction is stopped the hose will open back up and appear to be in good shape. You can use your fingers and squeeze the line the entire length and see if it seems to feel excessively soft, if so that could also be causing your problem.
You will open those things up, and they will probably look pretty clean, but the problem with your carbs is in the Idle circuit - too small for you to see into.
If you do a search of carb cleaning or related topics, you'll see that alot of folks with cab problems try to clean their carbs ... only to have to open them up again due to improper cleaning (They are difficult to clean properly, require alot of patience) So, I would suggest that you have them cleaned professionally, or at least buy good carb dip to get them really clean. Spray cans of carb cleaner are worthless. Might as well wash em with dish soap.