Slestak I wouldn't grind your pin and the lip on the drive face fits in the pulley at top speed. I think the lip is to get better low end on take off.
Why don't you get a stock fan pulley that doesn't have the raised lip. And 45mph is no joke, make sure your seat belts are to German torque specs (good-n-tight). We put nice cam lock 4 way belts on both buggies and always wear helmets because if you break a ball joint or tie rod at 45 hang on.
When we are ready for a new buggy the one you have is for sure my top pic. I want more power but air cooled motors are easy and don't want to mess with a radiator behind my head with 220 degree coolant.
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