Hey - installed 41 tooth rear sprocket about 2 weeks ago. cruises noticibly better & imho effortlessly at highway speeds. usually 65 to 75mph no problem. stock power configuration (no mods / with purge canister) has enough torque to haul a$$ without bogging anywhere through the gears. i thought for sure i'd be stalling somewhere in 1st or 2nd sometime around the block... not at all. with the 43 tooth rear i felt i reached the top end too soon most of the time on the open road...not any more! the stock chain (@7500km) is new enough that it leaves room for 1 or 2 more adjustments before i need to remove the one and a half links as recommended by the shop i bought the xt600 sprocket from. i'm luvin it!
also replaced the original headlight bulb with a piaa super plasma bulb ($39.95) which i feel is worth the extra bucks over the ($8.99) H4 from pep boys (it'd better be since i spent it already...right?). last night on my ride i noticed more focused & brighter low beam spread PLUS laser like blind 'em a mile away high beam performance. i like it. to minimize the nasty reflection behind the headlight fairing, i cut some black number plate sticky material down to a cone shape to fit between the headlight and the speedo which knocked the reflection down considerably.