100% New Racing Cylinder body +head for upgrade 50cc t0 70cc Yamaha Zuma. This kit will increase 20cc performance. This kit have to install with performance exhuast and increase jet size of your carburetor, if no performance exhaust and big jet installed, gas flow will not smooth, heat is bad to the engine.Big jet for more fuel also helps to cool down the engine heat. Please note, this kit will only work with the horizontal engine, will NOT work with the vertical models with the build-in reed port. Bold on and use, no modification needed. 1xPiston Kit (10mm wrist pin, Rings, Clips). The item "Racing 70cc Big Bore Cylinder Kit for Yamaha Zuma YW50 BWS 50 2002 2011" is in sale since Wednesday, May 31, 2017. This item is in the category "eBay Motors\Parts & Accessories\Motorcycle Parts\Engines & Engine Parts\Big Bore & Top End Kits". The seller is "powercycleparts" and is located in South El Monte, California. This item can be shipped to United States, Canada, United Kingdom, 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, Colombia, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay, Russian federation.