1999 Arctic Cat 300 4x4 - No Start

[phawesII]

hello im having trouble getting this quad to start have great spark and compression. i have cleaned entire carb. im getting gas in the air box and i had the machine backfire threw carb once any advice or ideas will be greatly appriciated thanks

[oxidized_black]

have you tried any quick start spray in the carb? it may need that to bite ... could be a lazy carb (dirty) or timing might be off with valves. try a new plug?

[phawesII]

i have tried that and put new plug in i also have cleaned carb i'll have to check timing and valves tomorrow. i will have to look up what clerances should be for valves

[Wonderwoman]

I had the same problem with our 2000 300 and it was the valves. Had to order new valves because the old intake ones ended up inside the head as the face wore down. While I was on a roll I tore the 2003 250 apart and it was just about to the same point. Redid the valves on that one too. Good luck.