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CYLINDER WORKS Power Valve (Big Bore +5.60 mm) – Yamaha Upgrade your 2-stroke off-road Yamaha with the CYLINDER WORKS Power Valve , engineered to help maintain peak performance under hard riding conditions. This big-bore power valve kit features precision machining and a durable protective finish for reliable power delivery. Key Features Maintains peak performance for stronger, consistent throttle response CNC-machined for precision fit and dependable operation Hard anodized finish for enhanced durability Made in the USA by CYLINDER WORKS Specifications Material: Steel Overbore: +5.60 mm Bore Size: 72.00 mm Units: Kit Engine Type: 2-Stroke Displacement: 250 cc Riding Style: Off-Road Color/Finish: Black, Anodized Product Name: Power Valve Weight: 0.35 lbs | Dimensions: 4.8" x 4.67" x 1.09"