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Wiseco PK1054 Top End Piston Kit with Gasket Set - 71.00mm 8.7 1 for YFM/YFB250

(1994-2000 Yamaha YFB250FW Timberwolf 4x4; 1992-1998 Yamaha YFB250 Timberwolf 2x4; 2000-2004 Yamaha YFM250 Bear Tracker + 2 more models)

Manufacturer

Picture for manufacturer Wiseco Pistons

Part Number

PK1054
9 reviews
Sale Price

$256.99

Estimated ship date Wednesday, November 25

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Product Details

The Wiseco PK1054 is a complete top end piston kit designed for Yamaha YFM and YFB 250cc ATV engines. Featuring a 71.00mm standard bore and an 8.7:1 compression ratio, this kit provides everything needed for a thorough top end overhaul or overbore rebuild, delivering a precise, performance-ready fit right out of the box.

Kit Includes:

  • High-performance forged piston (Wiseco forging number 4675M)
  • Piston rings (Wiseco rings — must be used exclusively with Wiseco pistons)
  • Wrist pin
  • Circlips
  • Top end gasket set

Key Specifications:

  • Bore Size: 71.00mm (Standard)
  • Compression Ratio: 8.7:1
  • Stroke: 58.00mm
  • Displacement: 229.6cc
  • Piston Material: Forged 2618 Aluminum Alloy

Why Choose Wiseco?

  • Engineered, forged, and machined in the USA (Mentor, OH)
  • Wiseco is the only U.S. aftermarket piston manufacturer that uses an exclusive forging process for every piston
  • Forged construction delivers superior tensile strength, impact resistance, and fatigue life compared to cast alternatives
  • Optimized strength-to-weight ratio via dedicated forgings for each specific engine application
  • In-house dyno testing ensures real-world performance validation

Wiseco forged pistons feature a condensed, aligned grain structure that resists fatigue and impact — critical for ATV engines subjected to demanding trail and off-road conditions. This kit is ideal for restoring or upgrading the top end on compatible Yamaha 250cc powersports engines.

Products specifications

Fits

1994-2000 Yamaha YFB250FW Timberwolf 4x4; 1992-1998 Yamaha YFB250 Timberwolf 2x4; 2000-2004 Yamaha YFM250 Bear Tracker; 2007-2009 Yamaha YFM250 Big Bear; 2005-2006 Yamaha YFM250 Bruin

Piston Material

2618

Prop 65

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Bore Diameter

71.00

Engine Type

ICE

Piston oversize

STD

Industry

Powersports

Out of Stock Message

Estimated Shipped Date 3-4 Weeks

Product Series

4 Stroke Forged Series

Product Type

Top End Kits

Product Market

ATV/UTV

EBAY Category ID

180159

Skirt Coating

No

Compression Ratio Actual

8.7:1

Piston Diameter

70.95

Title

Wiseco 4 Stroke Forged Series Piston Kit, 71.00 MM Bore, 8.7:1 CR

Included Components

Piston #4675M07100, Ring Set #2795XC, Wrist Pin #S271, CirClip #CW16, Gasket #W5745

Title - Web

Yamaha Wiseco Top End Kit - 71.00 mm Bore

Never received confirmation of product being shipped and was unable to get information from the web site. Had to call customer service (slow) where I finally got a tracking number. Other than that, good experience.

great.

Nice a stuff

a

Easy to follow, and found what I was looking for at a very reasonable price. I will be back for more. Customer service very very friendly and helpful when i had to return a part. Was completely no hassle and will gladly keep shopping with Autoplicity for

very smooth

Seller had the best price online for the item I wanted! Responded to emails within 24 hours as stated, and sent me my tracking info as soon as part shipped. Thanks Autoplicity!

Had then part I needed for a great price!

Good price and in stock !

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