Here we have the new 22-24 Honda Grom and Honda Monkey Big Bore Kit with a higher compression piston, which means more hp. This kit is the 53mm kit which takes your Grom or Monkey from 125cc to 140cc. This kit includes cylinder jug, high compression piston, rings, wrist pin, circlip, and gaskets. If you want to put that extra pep in your mini's  step and smoke your buddies, then this is the kit for you! Here at Send It Kartel, we are a family owned business that takes our business seriously. We strive very hard to provide the best experience possible for our customers. If you ever get stuck installing a part, we are here to walk you through it. We don't bail after the sale! All of our parts are in stock. We don't sell, then drop ship from China or wherever. So this gets the product to you faster, and we will stand behind our products. Everything we sell we wouldn't put on our own bikes. All of our products have been tested before we decided to have them made for the public. Please feel free to reach out to us with any questions or concerns. We thank you for your trust in us and purchasing our products.