DRR performance modifications for the DRR 50 70 90

 

porting

 

 head mods  works cranks
 case stuffing

 

  stator mods fly wheel mods
 case mods

 

  clutch mods  intake mods 
 

clutch air mod

 

 carb mods  piston mods

 DRR, Eton, Kasea and Polaris

 

50cc 70cc 90cc