I need to replace the engine, tank, and airfilter on my bike. I like gasbike.net because they have CNS carbs and grubee skyhawks. I had a good experience with their customer service, too. So I want to buy a new kit and sell some extra parts on eBay. The '09 is $20 cheaper, but doesn't have a cns Carb. And I think the crank is different on the '11, I heard it is better balanced.