need a refresher

I was just getting my hyper 7 converter when I had some unexpected problems come up, and since that time I lost all my notes so I hope someone can help with some questions. Heres the low down its a hyper7 with a 1512/1y/F motor, 25C 6000 battery, mmm v3 (just ordered), Can someone give me a good place to start on pinion size (spur 46) and a safe temp rage.

Thanks for any help that is given.