The B7 has two extra gears and four extra bearings. Stock motors will run slightly hotter if you run the same gear ratio. You need to reduce timing a little and adjust your gearing down for stock motors to reduce the heat. I keep my stock motors at 155deg or less at a 5min run and they last a long time.

The B7 is just so smooth to drive. Its a fantastic leap forward for a 2w. I've been running AE for a while, and I was going to try something else like a Schumacher 2w but after it was announced I had to get one. Its an excelent buggy. I did end up with a Schumacher L1R 4w so I do appreciate different stuff. I also mainly run mod, and theres no downsides to a B7 in mod.