GY6 125cc/150cc Engine Upgrade to 180cc with Cylinder Head Valves and Rebuilt Kit, 61mm Big Bore kits with Piston and Ring Assy for 152QMI 157QMJ Engine Chinese Scooter Moped ATV Go Kart Quad

I purchased this kit and it didnt fit as my casing would have to be bored out to fit the cylinder. I contacted the seller and discussed the issue with them they responded fast and they had another option that would fit they got it sent out right away and i had recieved my original package and the follow up package all in a little over a week total they were great and fast. If you have a 150cc there is a chance this will fit without boring the casing there is a video rolling wrench makes on youtube I found after the fact that shows the model# for the motors that 61mm fit without boring but not all will fit hope you have better luck than me on that end but again as far as the customer service they are getting a 5 star for the new product they sent me and how fast and helpful they were at getting the issue resolved. will definitely buy more products from them in the future for projects. Thank you,

It came used and broke

Did what it was supposed to

I have bought this product a few times and its not bad for the money.I am not sure what the review from christopher was all about its a over head valve engine what push rods are you talking about??????

Baught this kit to hopefully refresh and upgrade my 2009 scooters tiered engine...well first order the rings must be for the stock size piston and cylinder as they were way to small won't even hold themselves up in the cylinder to check gap...tried to find a way to contact seller but to no avail so I opted for a replacement....would you guess got the exact same rings again...completely useless....

This didn't fit our scooter and would have required it to be bored out.

After having to bore the case to get it to fit one of the push rods broke after two days off the engine running...

I have a 168cc so I would recommend a 58.4mm bore for drop in.