Quote Originally Posted by ataDude View Post
Update 8/16/2008: Logged about 300 miles today in all driving conditions... slow, fast, city, country. The 200 rpm surge is back. However, the seat-of-pants dyno thinks the bike runs stronger.
Sounds like a throttle body sychronization problem. The BMW R1100RT and R1150RT models are renowned for throttle surge. The best way around it is to make sure the throttle bodies are absolutely synchronized, and that the throttle cables are both exactly at zero play, or very close to it. There is more discussion of this on the BMW forums. Get somebody who is experienced with tuning throttle body injection, and have them play with it a bit. BTW, our Spyder has never shown a surge, but it has stock exhaust.
-Scotty