OS cv .12 .15 .18 will drop right in the evader...the .18 is alotta power probably too much for dirt running if you mainly run on asphault go for the .18 on dirt I'd go for a .15 or .12....they cost like $100....I got a .18 on mine and it's a ripper...not as fast as the Jato but it's snappy...will wheelie at anytime on demand...hell of alot more durable than them duratrax engines also...those are os rejects