Originally Posted by
Josh-n-ya
You have to take whole motor apart to make the adjustments I've mentioned. Be careful when removing any of the endbells to keep track of how many shims are on the rotor for each side. Also a shim or two can stay stuck to a bearing inside the sensor side. Wish I could be more help but I have since moved onto a better quality motor with no hassles.
Which motor did you end up going with? I have a 17.5 motor i need to get more RPMs out of for a spec class, but i'm going to open it and modify it like you suggested first