Wiseco 4669M08700 Forged ATV Piston Kit 87mm Bore 8.2:1 Compression 404cc

The Wiseco 4669M08700 is a high-performance forged piston kit featuring an 87mm bore size (1mm oversize) with an 8.2:1 compression ratio designed for 404cc ATV engines. This complete piston kit contains all the components needed to replace one piston, making cylinder repair straightforward and reliable.

What's Included:

• One Wiseco forged piston
• One complete piston ring set (Part Number 3425XC)
• One wrist pin (Part Number S475)
• Two wrist pin circlips (Part Number CW19)

Key Features:

• Forged from aerospace-grade aluminum alloy for superior strength and durability compared to cast pistons
• Condensed grain structure aligned to piston features provides higher mechanical properties and resistance to impact and fatigue
• Dedicated forgings provide superior strength-to-weight ratio
• All pistons are forged in-house in the USA with complete manufacturing control from raw material to finished coating
• Engineers utilize latest 3D design techniques and finite element modeling to ensure highest strength and lightest weight
• Built from race-proven designs chosen by top race teams in Supercross, Motocross, GNCC, Superbike, and more

Technical Specifications:

• Bore Size: 87mm (1mm oversize from stock 86mm)
• Compression Ratio: 8.2:1
• Displacement: 404cc
• Stock Engine Bore & Stroke: 86mm x 68mm

Important Installation Notes:

• Cylinder boring and honing required for proper installation of oversize piston
• Only Wiseco replacement rings, pins, and circlips are compatible with Wiseco pistons
• This is a single piston kit - multi-cylinder engines require multiple kits

Extreme racing conditions demand the strength and toughness that only forged pistons can offer, standing up to the abuse that high-performance motorsport applications require. Wiseco has built its reputation in the racing industry by sponsoring winning riders worldwide and participating in nearly every form of racing including Supercross, Motocross, GNCC, WORCS, Moto GP, Superbike, NHRA Pro Stock, Formula One, IRL, and Snowcross.