hows it run now? are you happy? if your short on cash and have a running bike, why not just save your coin till you need a rebuild. and yes if your thinking 4mill already do it the first time! its a lot cheaper to do the 4mill to start with, then if you where to port your stock cylinder for stoke stroke and want 4 mill later. call jeff at fast ... or any sit sponsor you want .. you will need cool head with cut domes for a 4 mill , crank , pistons, your stock cylinder ported for a 4 mill . thats the basics. then you could go into shift shaft mods . pancake bearing. advance timing plate. the list goes on just contact a site sponsor and decide what you can afford and how far you want to go. I will say though i have a stock stroke aggressive dune ported motor by f.a.s.t and it scream.