hi, putting my first bike together, a 26'' huffy sante fe model, installing a RAW,80cc motor,trouble is the left pedal crank hits into the muffler all the way down, by at least a 1/4 inch or so,tried pounding it down with a hammer, looks awful,and still hits just a bit by the end barrel of the pipe, any ideas on this?, yes,the motor is perfectly perpendicular with the frame, thank you.