Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778
Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778

Wiseco 83.50 mm 4-Stroke Forged Series Piston Kit PK1778

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  • $280.95
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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, 83.50 mm Bore, 8.6:1 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 4-Stroke Forged Series Piston Kit is designed for select Yamaha powersports applications. This kit features an 83.50 mm bore and an 8.6:1 compression ratio, with a dedicated forging engineered for the specific engine application. The forged material is designed to provide improved tensile strength, while the optimized strength-to-weight ratio supports service life and performance.

The 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, a pressure seal groove for maximum ring seal, and dedicated rings for compression and oil control. The piston is engineered, forged, and machined in the USA in Mentor, Ohio.

This Wiseco piston kit fits 1993–1999 Yamaha YFM400F Kodiak 4x4 models, 2002 Yamaha YFM400 Big Bear 2x4 and 4x4 models, and 2003 Yamaha YFM400 Big Bear 2x4 models. Manufacturer part number: PK1778. Vendor part number: PK1778.

Features:

  • Brand: Wiseco
  • Model: 4-Stroke Forged Series Piston Kit
  • Size: 83.50 mm bore
  • Compression Ratio: 8.6:1
  • Manufacturer Part Number: PK1778
  • Vendor Part Number: PK1778
  • Forged Construction: Dedicated forging with improved tensile strength and an optimized strength-to-weight ratio
  • Engine Design: Designed and built for the specific 4-stroke powersports engine application
  • Included Components: High-quality piston rings, wrist pin(s), and circlips
  • Piston Design: Dome design for improved flame travel, chrome-plated piston pin, and horizontal slot pin oiling
  • Sealing: Pressure seal groove and dedicated rings for compression and oil control
  • Manufacturing: Engineered, forged, and machined in the USA in Mentor, Ohio
  • Fitment: 1993–1999 Yamaha YFM400F Kodiak 4x4, 2002 Yamaha YFM400 Big Bear 2x4 and 4x4, and 2003 Yamaha YFM400 Big Bear 2x4



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
Clearance Item: t
Regular Stock: false
Units Per Sku: 1
Fitment:
1993 Yamaha YFM400F Kodiak 4x4 Base
1994 Yamaha YFM400F Kodiak 4x4 Base
1995 Yamaha YFM400F Kodiak 4x4 Base
1996 Yamaha YFM400F Kodiak 4x4 Base
1997 Yamaha YFM400F Kodiak 4x4 Base
1998 Yamaha YFM400F Kodiak 4x4 Base
1999 Yamaha YFM400F Kodiak 4x4 Base
2002 Yamaha YFM400 Big Bear 2x4 Base
2002 Yamaha YFM400 Big Bear 4x4 Base
2003 Yamaha YFM400 Big Bear 2x4 Base
2003 Yamaha YFM400 Big Bear 4x4 Base
2004 Yamaha YFM400 Big Bear 2x4 Base
2004 Yamaha YFM400 Big Bear 4x4 Base
2005 Yamaha YFM400 Big Bear 4x4 Base
2006 Yamaha YFM400 Big Bear 4x4 Base
2007 Yamaha YFM400 Big Bear IRS 4x4 Base
2008 Yamaha YFM400 Big Bear IRS 4x4 Base
2009 Yamaha YFM400 Big Bear IRS 4x4 Base
2010 Yamaha YFM400 Big Bear IRS 4x4 Base
2011 Yamaha YFM400 Big Bear IRS 4x4 Base
2012 Yamaha YFM400 Big Bear IRS 4x4 Base