PISTON KIT 74.00 CR 9.5:1 YFM250RX 08-13, XT250 13-19, WISECO 4951M07400 YAMAHA ATV

The Wiseco forged piston kit with a 74.00mm bore is designed as a direct replacement for Yamaha YFM250R Raptor (2008–2013), YFM250RX (2008–2013), and XT250 (2013–2019) models. Built in the USA, this high-performance piston is forged for strength and durability, with a moly skirt coating to reduce friction and wear.

Features

• Forged piston designed for high strength and resistance to impact and fatigue
• Moly skirt coating for reduced friction and improved wear resistance
• Manufactured in-house with full control over the forging and machining process
• Direct OEM replacement
• Made in the USA

Specifications

• Displacement: 249 cc
• Bore (Standard): 74.00 mm
• Actual Bore Diameter: 73.95 mm
• Stroke: 58.00 mm
• Compression Ratio (Actual): 9.5:1
• Skirt Coating: Moly
• Bore Oversize: STD

Cross-Reference OEM Part Numbers

• Piston: 4951M07400
• Part No.: 56-W4951.WI
• Ring Set: 2913XA
• Locks: CW17 (17mm Round Wire Locks – Set of Two)
• Pin: S688 (17 x 42 mm Non-Chromed TW)

Vehicle Fitments

• Yamaha YFM250R Raptor 2008–2013
• Yamaha YFM250RX 2008–2013
• Yamaha XT250 2013–2019