well, everyone is right. The cc rep is right, you can run the neus at 50k rpm all day- with a proper load. And everyone here at RCM is right. Less battery or less gear will drop your temps. But mostly, listen to Linc. Dropping the gearing will lighten the load and allow you to keep your high winding setup. It's "cool" to gear for 60mph but pretty impractical. You need a BIG space to go that fast and it's out of site in a second. Gearing for 45ish is plenty for me and I play real hard. Also playing with the punch control on the MMM can tame your wheelies down.

I run a 12lb Muggy on 6s with a Neu 1515 2.5D/F. I was running 12/48 gearing (just under 40mph) with no heat problems (150 motor 140 esc) with MGM 16024. I have geared up to 13/48 (a bit over 40mph) to give the new MMM a workout, still no heat problems (150 or so on motor and esc).

I run 40 series bowties, which save about half a pound of rotating mass and are a bit smaller diameter than stock. But I even tried some larger tires than stock (and about a half pound heavier), without much rise in heat; although the "punch" was noticably missing with that set up.

I have tried a higher kv motor (similar kv to 1515 1Y), a Plettenberg big max; but results were not good. MGM ESC would thermal if running for long as well as batteries getting hot, and ending with a demagnetized rotor. A lower kv motor would be the best bet IMO. I am quite happy with my 2.5D set up, it has plenty of power and runs forever without overheating. I may be able to get a bit more speed with higher capacity (or higher C) batteries, but it is fast enough for me now. I considered a 1521 1Y, but Mike had none in stock at the time I ordered the motor, that may be the way to go if you need more speed.

thanks to everyone for all the replies! I dropped down to the 12T on dirt yesterday, and for the 10 min that I ran, temps were NICE! I don't think there's any way that I can fit that big spur in there lincpimp, so if the 12T pinion doesn't keep me where I need/want to be, I will have to switch motors.

Please visit the castle forum and see my latest post.

Nice work.

Keep at it.

my muggy 1521 1900KV
11T/46
6s
16018
40 road raze
nice run! no temp problem
13T/46
hot 60degrees