Ok I need help, about to give up.

09 Klx250s carbureted. Worked fine when put away in fall, now no start only intermittent exhaust backfire. Have spark, fuel, even tried starting fluid, no luck. Any suggestions?

 

One thing that may be worth considering is dumping the old gas and starting with new gas to eliminate that from the equation? good luck!

E.T.A. IF you hadn't already done that....

 

I would put some fresh gas in it and try push starting it. For a couple months after I bought mine it would crank and crank and crank, but wouldn't fire off. Had spark, fresh fuel, lights and gauges all worked fine and didn't even dim too much when the starter was engaged. Battery didn't have enough power to spin the engine and fire off the engine for some reason.

I would crank it over for a little bit to get fuel to the engine, then push it through the yard and jump on it as I let the clutch out and went full throttle. I always used first gear, but I guess people recommend using second.

 

Crack the float bowl screw open and drain some gas out. Try again.

Strangely this works for mine when I haven't ridden it for a while.

Takes 5 secs.

 

Absolutely. Many places get crap gas. Ohio is one. With my KLX650 I have always had to drain the float bowl if the bike sat for more than 5 days - since 1710 miles - always. On my 250 it will go more like 2 weekw.

Jetting helps tremendously. One other thing, disable the compression release. Either take off the spring which will leave them free or if you know what you're doing you can wire them disengaged (all the way out) as I did, with some .090" wire. There is no need for the compression release with an electric start. All you are doing is blowing fuel charge out the open exhaust valve. Neither Yamaha nor Honda put one on their electric start 250s. Mine will spin and start in 8 degree weather.

 

I've gone totally ethanol free gas in mine. Plus use fuel stabilizer all year long. And if you can run that bike at least once a month during the off seasons.