Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950
Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950

Wiseco 39.50 mm 3950XZ Piston Kit, Model 4798M03950

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  • $146.95
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The Wiseco team has remained at the forefront of powersports performance through every era and evolution, including the development of high-performance 4-strokes. Today, Wiseco's forged 4-stroke pistons are designed for each specific engine application and built to the tightest tolerances for the ultimate combination of performance and strength. Proven at every level of riding, Wiseco 4-stroke pistons are ready to deliver the power and reliability you're looking for. Wiseco 4 Stroke Forged Series Piston Kit, 39.50 mm Bore, 11:1 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
  • 39.50 mm Bore, 11:1 CR

The Wiseco 4-Stroke Forged Series Piston Kit is designed for specific 4-stroke powersports engine applications. This kit features a 39.50 mm bore and an 11:1 compression ratio, with forged construction engineered to provide improved tensile strength, performance, and service life.

Wiseco part number 4798M03950 and manufacturer part number 3950XZ. The kit includes high-quality piston rings, wrist pin(s), and circlips. It fits 1988, 1989, and 1991–1998 Honda Z50R models, according to the provided fitment information. The product data also identifies fitment with Honda XR50 and CRF50F model applications, but no specific year-by-year fitment details were provided for those models.

The piston is engineered, forged, and machined in the USA in Mentor, Ohio. Verify engine application and fitment before installation.

Features:

  • Bore: 39.50 mm
  • Compression ratio: 11:1
  • Forged construction improves tensile strength and supports service life
  • Designed and built for specific 4-stroke powersports engine applications
  • Dedicated forging optimizes the strength-to-weight ratio
  • Includes high-quality piston rings, wrist pin(s), and circlips
  • Engineered, forged, and machined in the USA in Mentor, Ohio
  • Fits 1988, 1989, and 1991–1998 Honda Z50R models according to the provided fitment data



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:
1988 Honda Z50R Base
1989 Honda Z50R Base
1991 Honda Z50R Base
1992 Honda Z50R Base
1993 Honda Z50R Base
1994 Honda Z50R Base
1995 Honda Z50R Base
1996 Honda Z50R Base
1997 Honda Z50R Base
1998 Honda Z50R Base
1999 Honda Z50R Base
2000 Honda XR50R Base
2001 Honda XR50R Base
2002 Honda XR50R Base
2003 Honda XR50R Base
2004 Honda CRF50F Base
2005 Honda CRF50F Base
2006 Honda CRF50F Base
2007 Honda CRF50F Base
2008 Honda CRF50F Base
2009 Honda CRF50F Base
2011 Honda CRF50F Base
2012 Honda CRF50F Base
2013 Honda CRF50F Base