Wiseco Piston Kit 74.5mm 12:1 Compression Honda TRX250X 1987-1992 4440M07450

If you're running a TRX250X through demanding trail conditions or competitive racing, your factory piston likely won't survive sustained high-RPM abuse or aggressive tuning. This Wiseco piston kit replaces worn or damaged pistons with a high-silicon alloy forging that handles elevated compression and extreme thermal stress without sacrificing reliability. The 12:1 compression ratio unlocks additional power while maintaining the durability needed for both weekend warrior and race-day applications.

The kit arrives complete with rings and circlips, so you get everything needed for a straightforward installation—no additional hardware hunting required. Wiseco's precision engineering ensures a tight, consistent fit within your bore, which translates to reduced blowby and improved ring seal. Whether you're freshening an engine or building one from the ground up, this piston delivers the performance margin that separates competitive machines from stock setups.

• Bore diameter: 74.5mm
• Compression ratio: 12:1
• Material: High-silicon alloy
• Fitment: Honda TRX250X 1987–1992
• MPN: 4440M07450
• Includes rings, circlips
• Precision CNC-engineered
• High-RPM rated
• Bolt-on installation