Today I was riding. and all of a sudden my 250R quit running. I kicked it a few times and it started up and started revving all by itself. I pulled in the clutch and dropped it into first and gave it some gas and then it started bogging and would barely pull itself, then it died again and wouldnt start. Can someone tell me whats wrong? Someone told me it could be an airleak.

 

the kicking thing is not it because I had my dad pull me around on my recon and try to start it. still doesnt start and run right.

 

I think you need to add more blinker fluid.

 

Maybe you didn't kick it hard enough!

 

uhhh check the idle screw or whatever...maybe u got something caught in the chain? clutch problems? check out all the stuff.

 

Time to dive into the carb. Take it off, take it apart and clean everything really good and then reinstall it.
If you are curious about an air leak, which could be possible, pull the side cover off the left side. Is there ANY oil in there at all? If yes, you need to replace that crank seal.
Make sure your cylinder base gasket isn't leaking. Torque it down again (using proper specs, don't just throw a wrench on it and lean into it).

 

check your plug you might have fouled it
it will be black or wet.

 

Could possibly be water in the gas, but sounds more like a plugged fuel supply. (not out of gas are you?) If it has gas, even a full tank, try putting it on reserve. Better yet pull the fuel line off the carb and make sure you are getting gas.

 

oops

 

trapperb is incorrect..if there is oil under the left hand cover, you need to replace the counterbalancer holder/o ring. the crank seal has nothing to do with letting oil into the case. if the crank seals are bad, it will just leak air.