Wiseco Piston Kit 68.50mm Oversize Yamaha IT 250 1983 515M06850

Stock pistons on your 1983 Yamaha IT250 weren't designed for sustained high-RPM operation or aggressive trail riding—they'll eventually fail under demanding conditions. The Wiseco 515M06850 is a purpose-built replacement that delivers the durability and combustion efficiency your engine needs, whether you're racing competitively or pushing hard in the dirt. This oversize kit restores lost compression and responsiveness while eliminating the weak link in your top end.

Wiseco engineered this piston from high-silicon aluminum alloy to handle extreme pressure cycles without fatigue or scuffing. The precision CNC-machined design ensures tight tolerances that minimize blow-by and ring wear, while the optimized dome geometry improves fuel burn and boosts torque across the powerband. Installation is straightforward on your IT250—this is a direct bolt-in replacement that requires no frame modifications or custom machining.

• Size: 68.50mm oversize
• Material: High-silicon aluminum alloy
• Machining: CNC-precision manufactured
• Fitment: Yamaha IT250 (1983)
• Fitment: Yamaha YTZ250 Tri Z (1985-1986)
• Installation: Bolt-on replacement
• MPN: 515M06850
• Design: Optimized dome geometry
• Benefits: Improved combustion, increased torque