just put a custom snorkle 2", down to 1 1/2" over carb and into air box, i cant get it to run right , it pops and sputters a high rpm, i had a 165 main jet, and needle set on second slot from top, that's how i set it with the hmf exaust and it ran fine until i put the snorkle, now i have tried one bigger and one smaller jet and also tried adjusting the air fuel mix screw, and i'm having no luck at all, any suggestions would be greatly appreicated, thanks