146cc (57 mm) Bore Kit for Chinese 120cc and up Engines with 13mm Piston pin. New improved Aluminum cylinder with Ceramic coated bore (no steel sleeve) - High compression large dome 57mm piston with rings, 13 mm pin , & clips - Head gasket kit. This will make a very nice difference in performance over your stock setup.Additionally, it is a very quick and easy upgrade as it does not require case boring. We found the right level of compression for increased performance while also keeping reliability in mind. The kit includes a steel sleeved aluminum cylinder, light weight high revving piston and a head gasket kit. Important Note: This kit will only work on Chinese 120cc and up engines with a 13mm piston wrist pin. This kit is also recommended for use only with big valve heads such as the common Lifan head with 27/23mm valves or our Import Race Head with 30/23.5mm valves. Installation Notes : Its very important that you use Hondabond (or similar quality) sealer on the head gasket. Also, don't use the original o-rings between the head and cylinder (not needed) but do use the large o-ring at the bottom of the cylinder between the cylinder and the engine case at the oil return. The item "PIT BIKE 146cc BIG BORE CYLINDER PISTON KIT 13mm piston pin engine" is in sale since Thursday, October 29, 2015. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Other Motorcycle Parts". The seller is "hondaproducts" and is located in Beaverton, Oregon. This item can be shipped to United States, Canada, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, China, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, United arab emirates, Qatar, Kuwait, Croatia, Malaysia, Brazil, Colombia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Barbados, Bangladesh, Bermuda, Brunei darussalam, Ecuador, Egypt, Gibraltar, Guadeloupe, Iceland, Jordan, Cambodia, Cayman islands, Sri lanka, Luxembourg, Macao, Maldives, Nicaragua, Oman, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Montserrat, Turks and caicos islands, Bolivia, French guiana, Guernsey, Jersey, Liechtenstein, Monaco, Martinique, Peru, Russian federation.