I finally got that 48.bakaracer wrote:Put the 48 pilot in and open the screw to 1 7/8. Almost 2 turns. Try that. As for your speed,there must be something else going on. Mark the pulley with a sharpie to see how high the belt is riding.what brand belt are you using?
I believe i got a bit of stronger launch but lost some power up there, takes longer to get full speed. Throttle is still being usable at 50% max. I wanted to check plug color but one of the springs came off the clutch and couldn't ride anymore.
The other day I marked the pulley with the sharpie like you said... and today i took a picture so here it is... belt is riding this high:
And i got all this slack in the belt: