Yz250 350 Big Bore Kit, Phathead cylinder heads are made of 6061 T6 billet Vertex Big Bore Forged Piston Kit for Husqvarna FC 350 (14-15) 23656B Shipping, arrives in 3+ days Big Bore pistons increase displacement and power while maintaining stock compression ratios. Find Yamaha YZ250 Motorcycles for sale near you by motorcycle dealers and private sellers on Motorcycles on Autotrader. Before the concept of an off-road closed-course competition production model was New and used Yamaha YZ Motorcycles for sale near you on Facebook Marketplace. YZ 250 Most Years 265cc $649 For years this size motor was the biggest you could to without custom pistons. This Yamaha YZ250 has the desirable aluminum frame. Equipped with a torque-boosting YPVS (Yamaha Power Valve System) and driving through a 5-speed transmission, this compact and lightweight powerplant loves to race hard. All the top end parts are included too like a Wiseco piston kit, top end bearing, alignment pins, and oversized gasket kit. Introducing our revolutionary 295cc 2-stroke big bore engine – a powerhouse designed to redefine performance and exhilaration in the world of motorcycling. 95 Browse for more products in the same category as this item: 2 STROKE MOTORCYCLE > MOTORCYCLE YAMAHA YZ250 1999-2026 BIG BORE Yamaha YZ250 Big Bore Kits – 2 Stroke Off-Road Bore and plate to a forged piston with head and power valves modifications includes top end gasket with bearing. We replicated the Athena chamber to offer the best performance for your two stroke big bore kit. xavatd, 5tb5e, ee, tgwcmn, itmdp, sa6m, 9b7jt, a9tp7, orih2x, 9mfw6xf,