Stock shees arent that good on high gears, ive ridden a stock shee and on 5th or 6th gear it runs like crap,
i'd put some aftermarket pipes and some k&n filters and it'll make it WAY better.
If your gonna use stock pipes then 32:1 is good but yamaha recommends 24:1 but if your gonna put pipes then 40:1 is good,
a good transmission oil would be KLOTZ FLEXDRIVE 30, ATF TYPE F, and GEAR SAVER