This cylinder kit is an Eton direct replacement and may require a 70cc head if upgrading from a 50cc standard bore. For more power, this 70cc cylinder kit can also be used for the following but requires 70cc head part# 633302 
 E-Ton (Eton) Lightening TXL 50, 
 E-Ton (Eton) Lightening AXL 50, 
 E-Ton (Eton) Lightening NXL 50, 
 E-Ton (Eton) Viper RXL 50, 
 E-Ton (Eton) Viper RXL 50M, 
 E-Ton (Eton) Beamer, Beamer II, Beamer III, Matrix R2 
 Yamaha Jog 50 2 strokePolaris Sportsman 50,Polaris Outlaw 50,Polaris Predator 50, Adly, 
 Alpha Sports, 
 Vento, and many other Taiwan and Chinese 2 stroke motors. 
 E-Ton (Eton)# 811096 811091 Direct Fit
 Common applications include: 
 E-Ton Viper 70, RXL-70, 2003-06 (Vin: 7EE)