cranked my bike up today and she smoked for about 30 seconds then she was fine .what the hell?[img]i/expressions/face-icon-small-confused.gif[/img]

 

probably bad valve seals. the oil runs down the intake valve guide onto the face of the intake valve, and the incoming air/fuel picks up the oil and burns it, eventually all the excess will burn off. Its not that hard to fix on some bikes, but some can be nightmares.

 

White smoke? If so, I second what quicksilver said.

Before you start it next time, take the cap off the spark plug from the coil and turn the engine over a few times. See if the plug is oily.

 

white smoke just means water in the combustion cycle blue smoke mean oil. so if it has a blue tint to the smoke then its oil but if its white then its just water

 

its white smoke

 

Won't be water if it's air cooled! But white usually does mean water in the cylinder, or if it's kinda cold out. If it's air cooled and cold out than it's just condensation being burned inside the exaust.

 

what kind of smoke?? blue or black. white isnt in the question because white smoke= water or coolant. 300ex is air cooled. blue smoke=oil, black=fuel. if its blue, you've probably got valve stem seal issues. if its black, its running way fat until it warms up. (fat=rich). thats not a big problem. my 300 run rich in cold weather when the bikes not at operating temp.

 

sorry, didnt see where you said it was white. the only way you have water in your cylinder is for it to have come from outside the casing. have you had the atv deep in water?? have you sprayed water into your exhaust?? drain the oil and wee if the oil is milky, it'll look like coffee with alot of cream if its got water in it

 

Water in the combustion chamber would result in vapor, not smoke. I am assuming that when he says smoke, he means smoke and not vapor.

 

thats true, im going to bet the smoke is oil smoke. he should pull and read the plug to see if its oilly. i really dont see how water could get in the combustion chamber, or atleast enough to where it looked like it was burning coolant.