Wiseco 394M08700 Forged Piston Kit Oversize Bore - 2mm 87mm 3425TD

The Wiseco 394M08700 is a high-performance forged piston kit designed as a +2mm oversize replacement, delivering an 87mm bore for vintage Yamaha IT400 and YZ400 two-stroke engines. Built to race-winning standards, this piston is manufactured from high-silicon aluminum alloy using Wiseco's dedicated in-house forging process for superior strength, reduced weight, and optimal thermal performance.

Key Features:

• Bore Size: 87mm (+2mm oversize)
• Piston Ring Part #: 3425TD
• Wrist Pin Part #: CW18
• Forged from high-silicon aluminum alloy for maximum strength and durability
• Innovative forging design and optimized piston skirt profile for maximum horsepower and torque
• Complete kit includes piston, rings, wrist pin, and circlips
• Oversize pistons require cylinder boring or sleeving to the appropriate bore size

Wiseco rings, circlips, and wrist pins are engineered exclusively for Wiseco pistons and are not interchangeable with other brands. Note that ring types do not interchange between different Wiseco piston series. As an oversize piston, professional cylinder machining is required prior to installation.