I have a question. Are you using any washers on the motor mount bolts. If not , try using some and this might help keep the motor where you want it while tightening the bolts. Once tight, loosen them just enough that you can move the motor around but still tight enough that when you spin the main gear to find the high spot it stays put. Set your mesh on the high point of the gear like others said then tighten up the motor. Hope this helps...