OK, riddle me this. I had an offset carburetor intake. Until I lost the air filter By the time I realized and turned around it had been crushed by a car I mean crushed! Now I went back to standard Carb with flat plastic air filter. Everytime I come to stop or slowdown & pull in my clutch, VVRRRROOOOOOOOMMM!!!!!!! it wants to redline praticly. I even swapped out carburetors. Yahoo think my plug is too hot or??? Pin adjustment needed. Its on the center notch. From Chicago.