The Low reduction Gear Set "T Bar" is great. The Crank Induction. Is a great talking piont.
Look don't oversize to any more than you need. Oh, measure your end gap in the Ring down at the Port in the Barrel. This is where swell happens not the top.
Keep things gentle and small, ok? These are not Hot Rods! You Heat it it WILL Break. Stock they run around farms for 30 years.
That Low Gear will Pull you up any Hills a same age 250cc won't. Gearing! Over size will give nothing!! Porting will,Tons! Been there done that x 2000 times. I love em!
Lots of Snoozey stuff on the Net to buy. Watch your Rubbers on the Induction. Have fun they are a GREAT BIKE. Jim.