GY6 BIG BORE KIT 172cc / 171cc / 170cc (61mm)

FULL KIT: https://www.rollingwrenchdenver.com/p... 171 KIT ALONE: https://www.rollingwrenchdenver.com/p... It can get super confusing when choosing a big bore kit for your GY6 engine. Not all 61mm kits are drop in. Some call a 61mm big bore kit a 171 while other cheat and call it a 172c and some even under estimate the kit calling it a 170cc. Bottom line our kit is a drop in gy6 big bore kit. Not all on the market are! We have 15 years of experience building these GY6 engines. Don’t fall for a cheaper kit that Joe Shmoe is selling just to make a buck. This is our passion and you have our support. All of our big bore kits have the piston ring end gaps measured and installed on the piston. With the 61mm piston installed into the drop in cylinder. It doesn’t get any easier to install. Follow our step by step install video.