i have a genuine Honda GX160 engine on my kart ,and i have a slight problem ,its starts no bother 1st pull ,but den cuts out ,so i started it again and same thing happened i thought it was just cold but when i lift it off the ground and drive ,it seems to be spluttering and hasn't full power ,sounds like a dirty carb but that was recently cleaned im thinking it could be the spark plug gap ,any suggestions?