I have an SC104x4 RTR with the stock XP-SC900-BL ESC. My Reedy motor is about to blow up and I want to upgrade the motor only. Can anyone please explain how I figure out what the fastest/most powerful motor is that I can use with this ESC? The Reedy 550SL is 3500kV. Do I have to use a 3500kV motor or can I go bigger?
Thanks in advance for the help!
Z

The current draw of the ESC should be about 25% higher than the motor. You'll need to go the other direction, friend.

The specs are probably a good place to start:

Motor Limit: 2 LiPo, 5500kV; 3 LiPo, 4000kV

XP SC900-BL ESC

Although I'd leave a little margin for error using it in a 4x4 short course, even a relatively light one like the SC104x4.

Also best to understand why your motor is about to blow up, as brushless motors should last a long time. If running too hot for example, a faster motor will only make things worse. If so work on adjusting gearing to keep temps down.

Thanks for the help Fellas!
Somehow my quick search didn't lead me to that spec page, where it clearly shows motor limits. Question essentially answered.
The reason I think the motor is about to blow is because it now gets extremely hot compared to when the truck was new. How hot? Well, hot enough that it would burn your skin if you held your finger up to it for longer than two seconds. I do not remember it getting this hot when I first started running this truck. A friend had the same think happen to his stock Reedy motor in his 2WD SC10 and eventually the motor just quit. I figured maybe this just happens with the 'base model' motors. The ESC temp seems ok, even under the chassis cover. The ESC heat sink is hot, but you can keep your finger against it forever - if you had time...
So if I were going to try and solve the heating issue with this motor, I would gear it down by going to a smaller pinion?
Any motor recommendations for this ESC?
Thanks again for the help! Sorry for not doing more research before posting.
Cheers,
Z