GY6 205cc stroker H2O Big Bore Kit - ProBld

There it is, our PrBld 205cc water cooled 2v stroker big bore kit. This is an all-in-one top end solution. This is the largest big bore kit you can go on a GY6 A motor (54mm stud spacing qmj157). The GY6 A motor is the most common engine out of all the GY6 engines. You will be getting close to 21HP. Stock 150cc is 7…. So, ya! She’s a ripper! With it being water cooled ups the reliability in a major way! These big GY6 motors get hot quick when they are in the higher RPMs. With this being water cooled solves that. To start this kits comes with a 63mm ceramic coated cylinder with a forged 2 valve piston that has had the skirt trimmed so it plays nicely with the included 8.2mm stoker crank . It won’t  hit the crank on the way down. The cylinder head is wild too! It’s unique because it comes with our J-300 cam. This cam has a decompression. This is a must for these big motors. The valves are 30.5mm intake & 26.5 exhaust. The head will come with our valve cover (no longer ProBld logo on