Thought I would share with everyone my recent service on my M620. I went ahead and shelled out the bucks to have a 3k service done (glorified oil change), and decided to have them slap a 14t front sprocket and richen up the mixture using the mathesis program on the diagnostic computer. Just took it out in the canyons this morning and it runs awesome. My thoughts on the gear change are pretty much consistent with everyone else's experiences on this board. Revs run higher (runs at 5900 at 75mph in 5th gear now), which makes it a little more vibey when running quick on the freeway. However, in the canyons the new gearing is perfect. Pulls stronger and 3rd gear is where the money is at in the twistys. The tune is a must. It only cost me an additional $16 on my bill (.2 of an hour labor), and it seems to run smoother. The only mod I have is Stratified pipes, but I know the bike came lean from the factory. Much cheaper to "tune" than getting a power commander, etc. I'm sure if I opened the airbox I would need more than what they can tweak, but with this setup it seems to work great.