# Wiseco 90-06 Yamaha YFM/YFB250 8.71 (4675M07150) 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.

-   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

This Part Fits:

Year

Make

Model

Submodel

1992-1998

Yamaha

YFB250 Timberwolf 2x4

Base

1994-2000

Yamaha

YFB250FW Timberwolf 4x4

Base

2000-2004

Yamaha

YFM250 Bear Tracker

Base

2007-2009

Yamaha

YFM250 Big Bear

Base

2005-2006

Yamaha

YFM250 Bruin

Base

## Details

- **Price:** 386.59 CAD
- **Vendor:** Wiseco
- **Type:** Piston Sets - Powersports

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 386.59 CAD | In stock |

## Images

- Photo - Primary
- Photo - Primary
- User 1
- User 1
- User 1
- Photo - out of package

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> Source: [Standard Auto Part](https://www.standardautopart.com/products/wiseco-90-06-yamaha-yfm-yfb250-8-71-4675m07150-piston-kit)
> Updated: 2026-07-14