Hi i am new here i got an 1986 Xr 250 it got two new valves new piston rings and gaskets new spark plug and new fuel. she starts up one two kicks but puffs black smoke she running rich right? i took the air filter out and it helped cheaked the carb float level it all good. it burns gas like crazy with the air filter and no power in about 3 miles it emptied the tank 2 1/2 gal. with out air filter got power not as much as it should tho and a lot better on gas. the carb is like new in side and i cleaned it just to make sure nothing was blocked but still i don't need the coke to start and the choke is not sticking i even tried turning the pilot screw leaner it didnt help at all. the jets in the carb are 125 and 40 i think they are stock jets. could the jets be wore. i need some help i don't want to run without the air filter i need some help please?!!