Thanks for your reply, I guess "Xmil" describes the crank stroke. 4mil seems to be the regular setup for most bikes here
Thanks for your comments gotta_gofast. About my bike, it's basically a MX setup (LT setup, wider front/rear ends and basic motor add-ins. You can see more details here http://bansheehq.com/forums/index.php?showtopic=153487&st=0&p=1327642entry1327642). It's my 4th Banshee, I ride only at sand. Want to get some extra power, but only for Dune/Play, not drag or track racing. I actually wanted to get the specific descriptions about the standard, most common motor works to create a chart including some details as make, description, bore, estimated HP, use, etc. (this will be useful for anyone looking for the available options)
Thanks for your reply Adam, found that post really useful. I'll keep lookin' for related posts and see what shows up