Standard piston kit. 40mm.
Original fitment to the following machines:
Adly Cat50
Aeon Cobra50
Aprilia Amico50
Aprilia Area51
Apriliia Rally50 AC and LC
Aprilia Sonic50 AC and LC
Aprilia SR50 any with Yamaha engines
Aprilia (Yamaha Scooter 50cc L/C engine
Aprilia (Yamaha Scooter 50cc A/C engine
Yamaha BWS50 (BI-Wizz)
Yamaha CY50 Jog-in
Yamaha EW50 Slider
Yamaha YH50 Why
Yamaha YN50 Neos
Yamaha YQ50 Aerox
Same as 938020
