Wiseco 91.00 mm PK1591 4-Stroke Forged Series Piston Kit

Premium materials produce the best sealing technology available exceeding O.E.M. standards. 2-Stroke: Wiseco top end gasket kit; Dedicated forging; Superior strength/weight ratio utilizing Aerospace alloy; Race-proven designs; Chosen by top race teams, in all forms of racing; CNC machined; Optimal cam shape and profile for peak HP and service life; Premium top end needle bearing; Precision-machined, highest-quality materials for strength and reduced friction; High-performance ring set; Extended life and sustained power; Highest-quality alloy pin; Consistently true and durable. 4-Stroke: Wiseco top end gasket kit; Premium materials produce the best sealing technology available, exceeding O.E.M. standards; Dedicated forging; Superior strength/weight ratio utilizing Aerospace alloy; Dome design; Improved flame travel; Chrome plated piston pin; Horizontal slot pin oiling; Reduced friction/scuff resistant; Pressure seal groove; Maximum ring seal; Armor Glide Skirt-Coated available for select models; Dedicated Rings; Maximum compression and oil control. Wiseco 4 Stroke Forged Series Piston Kit, 91.00 mm Bore, 9.5:1 CR

• Improved tensile strength of forged material optimizes strength and service life
• Designed and built for each specific 4-stroke powersports engine
• Dedicated forgings allow for optimized strength-to-weight ratio
• Includes high-quality piston rings, wrist pin(s), and circlips
• Engineered, forged, and machined in the USA in Mentor, OH

The Wiseco PK1591 4-Stroke Forged Series Piston Kit features a 91.00 mm bore and a 9.5:1 compression ratio. It is designed and built for specific 4-stroke powersports engines, with a dedicated forging that optimizes the strength-to-weight ratio. Improved tensile strength helps support service life and performance.

This piston kit includes high-quality piston rings, wrist pin(s), and circlips. Additional design features include a dome design for improved flame travel, a chrome-plated piston pin, horizontal slot pin oiling, reduced friction, a scuff-resistant surface, a pressure seal groove, and dedicated rings for compression and oil control. Wiseco states that the piston is engineered, forged, and machined in the USA in Mentor, Ohio.

Fitment includes 1998–2002 Honda TRX450FE FourTrax Foreman ES and 1998–2002 Honda TRX450FM FourTrax Foreman S models. Manufacturer part number: PK1591. Vendor part number: 4825M.

Features:

• 91.00 mm bore and 9.5:1 compression ratio
• Forged 4-stroke piston designed for specific powersports engines
• Dedicated forging optimizes the strength-to-weight ratio
• Improved tensile strength supports performance and service life
• Includes high-quality piston rings, wrist pin(s), and circlips
• Dome design improves flame travel
• Chrome-plated piston pin with horizontal slot pin oiling
• Pressure seal groove and dedicated rings support compression and oil control
• Engineered, forged, and machined in the USA in Mentor, Ohio
• Fits 1998–2002 Honda TRX450FE FourTrax Foreman ES and TRX450FM FourTrax Foreman S models

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: powersports
Epa: N/A
Regular Stock: false
Clearance Item: t
Units Per Sku: 1
Fitment:
1998 Honda TRX450FE FourTrax Foreman ES Base
1998 Honda TRX450FM FourTrax Foreman S Base
1999 Honda TRX450FE FourTrax Foreman ES Base
1999 Honda TRX450FM FourTrax Foreman S Base
2000 Honda TRX450FE FourTrax Foreman ES Base
2000 Honda TRX450FM FourTrax Foreman S Base
2001 Honda TRX450FE FourTrax Foreman ES Base
2001 Honda TRX450FM FourTrax Foreman S Base
2002 Honda TRX450FE FourTrax Foreman ES Base
2002 Honda TRX450FM FourTrax Foreman S Base
2003 Honda TRX450FE FourTrax Foreman ES Base
2003 Honda TRX450FM FourTrax Foreman S Base
2004 Honda TRX450FE FourTrax Foreman ES Base
2004 Honda TRX450FM FourTrax Foreman S Base
2004 Honda TRX450R Base