{"product_id":"yamaha-pw50-60cc-big-bore-kit","title":"Yamaha PW50 60cc Big Bore Kit 1981-2009 – Cylinder, Head, Piston, Gaskets \u0026 Studs Top End Kit","description":"\u003ch2\u003eYamaha PW50 60cc Big Bore Kit – Complete Top End for 1981–2009 Models\u003c\/h2\u003e\n\u003cp\u003eThis Yamaha PW50 60cc big bore kit replaces the stock top end on the little two-stroke PW50 with a larger cylinder and everything needed to fit it. It is listed for PW50 models from 1981 through 2009. In the box you get a cylinder block, cylinder head, piston, rings, pin, small end bearing, gaskets, studs, nuts and a spark plug, plus gasket maker and thread lock for assembly. Easy Life Markets sells it as a complete kit, so you are not left hunting for a missing gasket halfway through the job.\u003c\/p\u003e\n\n\u003cp\u003eThe \u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Yamaha_PW50\" target=\"_blank\" rel=\"noopener\"\u003eYamaha PW50\u003c\/a\u003e is one of the most popular first bikes for young riders, and plenty of them have been passed down through families and ridden hard for years. Yamaha still sells the current model, and you can see it on the \u003ca href=\"https:\/\/yamahamotorsports.com\/models\/pw50\" target=\"_blank\" rel=\"noopener\"\u003eofficial Yamaha PW50 page\u003c\/a\u003e. When the original top end is worn out, many owners take the chance to fit a 60cc big bore cylinder instead of a stock replacement.\u003c\/p\u003e\n\n\u003ch2\u003eWhy Riders Fit a PW50 Big Bore Kit\u003c\/h2\u003e\n\u003cp\u003eThere are two common reasons to buy this kit. The first is repair: a PW50 that is hard to start, has lost compression, or has a scored cylinder needs a new top end anyway. The second is growth: as a young rider gets more confident, a larger bore can give the bike a bit more pull than the stock 50cc setup. Either way, you are replacing the parts that wear most on a two-stroke engine in one go.\u003c\/p\u003e\n\u003cp\u003eTypical signs that your PW50 top end needs attention include:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHard starting or no start, even with a good spark plug and fresh fuel\u003c\/li\u003e\n\u003cli\u003eLow compression when you kick it over\u003c\/li\u003e\n\u003cli\u003eNoticeably less power than it used to have\u003c\/li\u003e\n\u003cli\u003eScoring or damage on the cylinder wall or piston\u003c\/li\u003e\n\u003cli\u003eRattling or knocking from the top of the engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat Is Included in the Kit\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e1 x cylinder block\u003c\/li\u003e\n\u003cli\u003e1 x cylinder head\u003c\/li\u003e\n\u003cli\u003e1 x piston\u003c\/li\u003e\n\u003cli\u003e2 x piston rings\u003c\/li\u003e\n\u003cli\u003e2 x circlips\u003c\/li\u003e\n\u003cli\u003e1 x piston pin\u003c\/li\u003e\n\u003cli\u003e1 x pin bearing (small end bearing)\u003c\/li\u003e\n\u003cli\u003e1 x head gasket\u003c\/li\u003e\n\u003cli\u003e1 x base gasket\u003c\/li\u003e\n\u003cli\u003e4 x cylinder studs\u003c\/li\u003e\n\u003cli\u003e4 x stud nuts\u003c\/li\u003e\n\u003cli\u003e1 x spark plug\u003c\/li\u003e\n\u003cli\u003e1 x gasket maker\u003c\/li\u003e\n\u003cli\u003e1 x thread lock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe product photos show the cylinder, head, piston and hardware laid out so you can compare them with the parts on your bike.\u003c\/p\u003e\n\n\u003ch2\u003eSpecifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct type:\u003c\/strong\u003e Big bore cylinder top end kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplacement:\u003c\/strong\u003e 60cc big bore\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eListed fitment:\u003c\/strong\u003e Yamaha PW50, 1981–2009\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine type:\u003c\/strong\u003e Two-stroke, single cylinder (PW50)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCylinder and head finish:\u003c\/strong\u003e Black, finned, as pictured\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit contents:\u003c\/strong\u003e 22 pieces in total (see list above)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSKU:\u003c\/strong\u003e CJQT301229301AZ\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eFitment Notes\u003c\/h2\u003e\n\u003cp\u003eThis kit is listed for the Yamaha PW50 from 1981 to 2009. Before ordering, confirm the model and year on your bike's frame plate or paperwork. If the bike has already been modified, for example with a different intake, reed block or exhaust, compare the port layout and gasket shapes in our photos with your current parts. If anything looks different, \u003ca href=\"\/pages\/contact\"\u003econtact us\u003c\/a\u003e before ordering and we will help you check.\u003c\/p\u003e\n\u003cp\u003eKeep in mind that a bigger bore changes how the engine breathes. Many riders find the carburetor jetting needs a small adjustment after fitting a big bore kit, so check the spark plug color after your first few rides and adjust if the bike runs rich or lean.\u003c\/p\u003e\n\n\u003ch2\u003eInstallation Tips\u003c\/h2\u003e\n\u003cp\u003eFitting a PW50 top end is one of the easier engine jobs, and many parents do it at home with basic hand tools and a service manual. A few points to help it go smoothly:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClean the crankcase gasket surface carefully and stuff a clean rag into the crankcase opening before removing the old circlips.\u003c\/li\u003e\n\u003cli\u003eFit the new pin bearing in the connecting rod small end, then the piston and pin, and make sure both circlips click fully into their grooves.\u003c\/li\u003e\n\u003cli\u003eLine up the ring end gaps with the locating pins in the piston grooves. Two-stroke rings must sit on their pins or they can snag a port.\u003c\/li\u003e\n\u003cli\u003eOil the piston, rings and bore with two-stroke oil before sliding the cylinder on.\u003c\/li\u003e\n\u003cli\u003eUse the supplied thread lock on the studs and tighten the head nuts evenly in a cross pattern to the torque in your service manual.\u003c\/li\u003e\n\u003cli\u003eRun the engine gently for the first few rides to let the new rings bed in.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eGetting the Most from Your New Top End\u003c\/h2\u003e\n\u003cp\u003eA fresh big bore cylinder will last longer if the basics are right. Mix the fuel and two-stroke oil to the ratio in your owner's manual, and use fresh fuel rather than something that has been sitting in a can all winter. Keep the air filter clean and oiled, because dust is the fastest way to wear out a new piston and cylinder on a dirt bike. Check the spark plug after the first few rides to see how the engine is running, and keep an eye on the head nuts and exhaust connection, which can settle slightly once the new gaskets have been through a few heat cycles.\u003c\/p\u003e\n\n\u003ch2\u003eIs This the Right Kit for You?\u003c\/h2\u003e\n\u003cp\u003eIf your PW50 needs a new top end and you are happy with a 60cc big bore rather than a stock 50cc cylinder, this kit covers the whole job in one purchase. It suits parents keeping a family pit bike running, small shops that service mini bikes, and riders restoring an older PW50. If you want to keep the bike exactly stock, a standard-size cylinder kit would be a better choice.\u003c\/p\u003e\n\n\u003ch2\u003eBuy the Yamaha PW50 60cc Big Bore Kit at Easy Life Markets\u003c\/h2\u003e\n\u003cp\u003eYou can order this PW50 big bore kit right here. The current price and availability are shown on this page. Questions about fitment can go to our \u003ca href=\"\/pages\/contact\"\u003ecustomer service team\u003c\/a\u003e, and you can read our \u003ca href=\"\/pages\/return-refund-policy\"\u003ereturn and refund policy\u003c\/a\u003e before you buy.\u003c\/p\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yamaha-yz125-full-gasket-kit\"\u003eYamaha YZ125 full engine gasket kit\u003c\/a\u003e for bigger two-stroke Yamaha rebuilds\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/yamaha-ttr250-carburetor\"\u003eYamaha TTR250 carburetor\u003c\/a\u003e for 1999–2006 TT-R250 trail bikes\u003c\/li\u003e\n\u003cli\u003e\n\u003ca href=\"\/products\/sdh150-cylinder-kit\"\u003eSDH150 cylinder kit\u003c\/a\u003e for 150cc motorcycle top-end rebuilds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eYou can also browse our \u003ca href=\"\/collections\/pistons\"\u003epistons collection\u003c\/a\u003e, \u003ca href=\"\/collections\/gaskets\"\u003eengine gaskets\u003c\/a\u003e and wider \u003ca href=\"\/collections\/engine-parts\"\u003eengine parts\u003c\/a\u003e range.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNotice:\u003c\/strong\u003e California Prop 65 Warning.\u003c\/p\u003e\n\n\u003ch2\u003eProduct Photos\u003c\/h2\u003e\n\u003cp\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/6d351765-505e-40e8-8bb0-87902ac62876.jpg\" alt=\"Yamaha PW50 60cc big bore kit\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/38eab2fd-bad7-4b98-b9f8-98c433be3c6a.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/1fc48176-993a-4514-9382-68271815405f.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/0a799844-f090-4817-8503-5a0aca38dc1c.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/843b7309-9868-47ba-ae95-5285eb9f775b.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/8521247a-c4d7-4f8f-9c9d-27329b686bf2.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003cimg src=\"https:\/\/cf.cjdropshipping.com\/4ffef6d0-00f4-4833-92c7-4c1436efb2f7.jpg\" alt=\"Yamaha PW50 60cc big bore kit detail\" style=\"max-width:100%;\"\u003e\n\u003c\/p\u003e","brand":"easylife markets","offers":[{"title":"57132051","offer_id":46969652740257,"sku":"CJQT301229301AZ","price":310.51,"currency_code":"AED","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/2086\/9537\/files\/18fb9941-bb29-4c9c-8c15-b651a0f77a35.jpg?v=1788563740","url":"https:\/\/easylifemarketplace.com\/products\/yamaha-pw50-60cc-big-bore-kit","provider":"Easy Life Markets","version":"1.0","type":"link"}