GY6 172cc (61mm) Scooter Performance Kit and Kaboodle

All the performance you need put into one kit! We have spent years testing and selling other kits. Some things we liked and others we didn't. We pieced this kit together with the best of the best materials (rings, gaskets, springs, and metals) This 12:1 compression ratio 171cc kit (or as some call it 172cc) requires no case boring, unlike some others on the market, and is a "drop in" kit. It is the largest big bore kit you can go on the GY6 A motor (Chinese GY6 QMJ157). Like they say, “there is no replacement for displacement“. Another cool thing is, the piston ring end gaps have been set and installed into the cylinder. This eliminates a ton of work and liability on your end. Easy peezy! For the money, this kit flat out rocks! We even have a install video! ATTENTION BUGGY & GO KART OWNERS: WE HAVE NOT PERFECTED ALL THE GY6 ENGINE MODELS IN THE BUGGIES TO KNOW IF IT WILL FIT OR NOT. BUY AT YOUR OWN RISK. **PISTON RING GAPS HAVE BEEN MEASURED AND PRE-INSTALLED ONTO THE PISTON, THEN