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John, the 904 BB is not worth it on a 865. Too much money for not that much gain (on the 865). Your best bet is carbs, bigger valves, or cams. The cheapest gains you can make are pipes, open air filter, and re-jet.
I disagree. My 865 is apart right now for a 904 kit. Although it is only 39cc's more it's the upped compression and forged pistons that make it worth it. I'm also installing 2mm larger intake valves which would not fit with the stock pistons, so the wiseco kit was necessary for this option. It is also the biggest you can go without machining the cases. Wiseco is developing a no-stroke 990-ish CC kit now, and a stroked version that's going to be around 1200ccs. These are great, but require a total engine teardown and lots more machine costs. The 904 is a nice compromise between practical power and rediculous costs. I think it is definately worth it on 865 motors.
Also, you people that pay others to do the engine work must have more money than sense, or more money than time, or just more money than me. Following Dinqua's instructions this is barely more difficult than an oil change. My big bore with machine work and all the gaskets etc is going to cost me just over $800 bucks, and about 15-20 hours of my time, and the satisfaction of having done it myself is included for free in the costs previously mentioned.
Also, no one is making cams for these bikes and publishing specs, frankly I don't trust anyone's cams with my $800+ dollars for questionable gains. Big bore, carbs, and big valves are where it's at, once the exhaust has been sorted.
There is no greater thrill than being shot at with no consequence. -Churchill
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