Originally Posted by
pete 26
The Orion CRF.21 stock is faster than a speed but I don't know about the modded JPX.If you want a truggy engine to modify the go tech .25 with just a little port and crank work will crush these engines and the price is right but they don't last like an OS.
A CRF and a JPX perform nearly identical...the CRF has a little more punch and the JPX has a little more top end..