Scott, Congratulations on the successful completion of your build, feels great doesn't it. Stalling is a jetting issue (imho) more than a engine design issue. if you go rich enough for starting to become difficult it becomes very very hard to stall, finding a balance between starting and stalling is key. Pre-rekluse The 500 didn't stall particularly easy (i cant say it was hard to stall) but it chugged along through rocky rough slow stuff as good or better then any other bike I've ridden. I've never been a fan of a FWW, I don't like what they do to the power delivery feeling. My reason for using the EXP over buying a Pro were twofold, First I already had a 450sxf exp disc (same as the cr250 & cr450) and second I hate (really HATE) the feeling of the pro at the lever. I'm not really a fan of how it engages either. I still use the clutch like normal, and with the exp it feels and behaves just like a stock clutch (that you have a really hard time stalling) The only time I notice the vibes is if I switch between 2t and 4t bikes, otherwise I don't notice except revving it in neutral, or occasionally on miles and miles of high speed 2 track/fire roads. Just make sure all your mounts are tight.