Hi all,
Just purchased this klx300 off a mate who no longer rides , been sitting in the garage for 2 years..
wouldn't start so, drained fuel and cleaned carb... got it running (but like a dog) any suggestions as to what it could be?
https://share.icloud.com/photos/067a...LcM0jxh17BWxlA

 

The most likely culprit is still the carb.

Fuel turns to varnish which solidifies in the carb, so disassemble everything including the jets, soak everything in solvent and blow out all of the jets and passageways to make sure they're all clear.

KLX carbs are constant velocity which utilizes a vacuum operated slide to determine the sice of the aperture along with the butterfly. If that slide does not operate properly your bike will run like a dog. replace the slide diaphram if it has gotten hardened or is cracked, and make certain that slide moves up and down perfectly freely. Replace the carb hoses. If any of them are cracked the engine will suck in too much air and your bike will run like a dog. Also check the needle and seat to make sure it is closing at the proper fuel level in the bowl.

 

I'd agree with Tooter. Carb cleaning isn't as easy as it seems, particularly when doing it by hand without a carb washer or ultrasonic cleaner. I got a gallon of Berryman carb cleaner, which has a basket in it, to soak the carb I was cleaning. I read the directions on the can then allowed the carb to soak for the time they recommended, after sloshing the parts and body around in the basket in the solution. Worked out well. It may be possible to have the body cleaned at a car or bike shop that has a carb washer or ultrasonic cleaner if it doesn't cost too much. Otherwise the Berryman works well, use some nitrile gloves, the stuff is not good for skin contact.