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After anything with a carburator sits for a while you need to clean the carb. Your problem is likely because of clogged jets. Inside the carb is little tubes and things that look like hollow needles. Clean those out and make sure the fuel filter gets replaced. I had the same problem when my 78 honda sat for a year.
Sounds like your carb is dirty inside. make sure its out of warranty first, (don't want to void it), then pull off the bowl at the bottom of the carb and clean it. Try to avoid useing acetone based cleaners as this can sometimes ruin some seals/gaskets/components.
the air/fuel mixture may be too high on the carb.
there are adjustment screws on the carb.
make very small adjustments.
keep in mind that 2stroke engines like yours are supposed to have oil/gas in the exhaust.
you could lean the fuel/oil mix a little if it is a very excessive amount.
Try checking your fuel lines and make sure there are no leaks and try running some carb cleaner through it and if thats not it then try emptying the fuel out or running it all out but it could have water in the fuel and check your fuel pump, but really it could be many of things, just get back to me if those dont work.
If there is any gas flowing out of a Mountain Bike you have serious problems.
In reality you have a Motorcycle, not a Mountain Bike.
It's almost surely a stuck float valve. Try banging on the float bowl with a rubber mallet, but not too hard. You should really take off the bowls and clean them out, then replace the float valve pins and check the floats for any holes or for sticking action. Sometimes the floats will stick open due to rust gunk or old gas gummed up in there. I use Sea Foam fuel additive to help keep the carb clean. You could try running a half bottle of that through a bit, but I'd start by getting that bugger unstuck first.
I had the same problem. the drain hose on the carb is supposed to have a little valve in it. it is meant to drain your carb when you winterize, HOWEVER, they fall off and fuel runs out. Screw a small bolt into the end of the hose and bingo- it runs.
Hello, I would start first, make sure ex pipe is open . Then I would check the pick up coil, ohms should be 390-590 on a 300 KLF. Do this test before u start the bike Then start the bike and when it quits running check the pick up coil ohms. If good move on to the coil, If good then I would say good chance CDI is bad I hope this helps
Turn on gas with the carb bowl off and float hanging and see how much fuel flows.It should be a steady stream.Have seen the seat in the needle and seat swell that only lets gas drip through not enough to keep it running.