Big bore kits are unrivalled for increasing power and torque on your scooter engine.
Suits Yamaha 2 strokes 50cc with horizontal engines including:
Jog (all 2 stroke horizontal engine)
Axis 50 (all 2 stroke)
Vino (all 2 stroke)
and clones too including FYM Urban (not R4), CPI Hussar pre '03, Adly GTA-50,Silver Fox, Gatecrasher and RT50 plus most Chinese horizontal engined 2 stroke imports. Increases capacity to 70cc for more torque and power. Comes with big port cylinder, alloy piston (10mm gudgeon pin), new pin and clips, gaskets. Uses standard head. (Sample photo shown)
Review 6 Oct 2006: "The 68cc kit works well" B.D., Christchurch
This kit must be fitted and carb tuned by a technician or skilled person. Piston seizure is a symptom of poor carb tuning and claims regarding these kinds of problems will not be accepted. This increases engine size so that your bike may not be legally registered as a moped.