Wiseco 561M08750 Forged Piston Kit Oversize - 87.50mm 1.50mm

The Wiseco 561M08750 is a high-performance forged piston kit machined to 87.50mm bore diameter, representing a 1.50mm oversize specification. Designed for demanding powersports applications, this piston kit delivers the strength and durability that serious riders require.

Wiseco forges all of their pistons in-house in the USA, maintaining complete control over every stage of the manufacturing process — from raw bar stock through final skirt coating. This end-to-end quality control ensures consistent performance and dimensional accuracy in every kit.

Key Features:

• Forged construction — superior strength-to-weight ratio compared to cast alternatives
• 87.50mm bore diameter — 1.50mm oversize for engine rebuilds requiring additional clearance
• Condensed, aligned grain structure — resists impact, fatigue, and catastrophic failure under extreme loads
• In-house USA forging and tooling — full manufacturing process control from raw material to finished part
• Skirt coating applied — reduces friction and improves break-in characteristics
• Optimized strength-to-weight ratio — maximizes power output without adding unnecessary mass

Unlike cast pistons, which can be brittle and prone to sudden failure when material yield strength is exceeded, Wiseco forgings feature a dense, aligned grain structure that provides significantly higher mechanical properties. This makes the 561M08750 an ideal choice for high-performance and racing environments where reliability under stress is non-negotiable.