having lots of problems with this quad. Black smoke all the time at idle,mid and full throdle. I have cleand carbs!!! all jets are clean and clear. lots of spark! and gas. Don't know were to go from here!!! anyone know the valve specs so i can check them? seems to be no info out there for this year of quad. spark plugs foul they are black with carbon... i have ran sea foam threw tank a couple of times but no luck. jets are stock and so it the quad.. any help with this problem and maybe and email with shop manual would be great!!!!