Yamaha 85s, lower the barrel to 30thou squish, raise compression with EHR head, don’t machine std head. Machine upper exhaust port upwards 15thou. Make the flywheel heavier with add on weights. We do a lot of work on crankcases to increase flow that gives more torque, we have EHR working on new parts for this engine. Scalvini Exhaust is great! Rear Swing Arm is too short for SHOCKY to function well. Hinson clutch is best on this engine.
Best Mods: VFORCE HGS – Barrell mods. VHM Head.