you can run it over with a car and they will take it back, smash it with a sledghammer, lol. read the erp:

http://www.redcatracing.com/pressrelease.asp?id=1001

"For as long as you own your vehicle, Redcat will replace your engine no matter what happens to it. Burn it up, wear it out or beat it with a sledge hammer, Redcat will replace it for same or upgraded motor for only 1/2 of the retail price of the replacement motor you want to buy."