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Engines and Components› Pistons and Piston Rings
Wiseco
Wiseco 4 Stroke Forged Series Piston Kit, 79.00 MM Bore, 13.2:1 CR
SKU: W00C PK1242
Moderate — 2–4 hours
Overview
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Part #: PK1242
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.
Features:
- Engineered, forged, and machined in the USA in Mentor, OH
- Designed and built for each specific 4-stroke powersports engine
- Improved tensile strength of forged material optimizes strength and service life
- Dedicated forgings allow for optimized strength-to-weight ratio
- Includes high-quality piston rings, wrist pin(s), and circlips
Wiseco 4 Stroke Forged Series Piston Kit, 79.00 mm Bore, 13.2:1 CR
This product may expose you to chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm.
Vehicle Symptoms
- loss of compression and hard starting
- excessive oil consumption with blue smoke
- audible piston slap or knocking from top end
- significant power loss under acceleration
- low idle or stalling after warm-up
Relevant Conversations
- Wiseco piston kit PK1242 YZ250F compatibility
- YZ250F 2002 low compression top end rebuild kit
- Wiseco vs OEM piston YZ250F 2001-2004
- YZ250F piston slap knocking noise top end
- WR250F 2003 79mm piston kit 13.2:1
- YZ250F burning oil top end rebuild piston rings
- how to install Wiseco forged piston YZ250F
- YZ250F hard start loss of compression after rebuild
- best piston kit Yamaha YZ250F 2004
- Wiseco PK1242 installed piston clearance specs
Product descriptions are provided by our supplier partners and may not always be perfectly accurate. Not sure this fits? or call (760) 282-4645 and we’ll verify before you order.
Fitment
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Specifications
| Brand | Wiseco |
| Part Number | W00C PK1242 |
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Returns & Fitment
Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.
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Orders are processed in 1–3 business days. In stock parts ship promptly from our partner network. Special-order items either aren’t currently stocked or are built to your spec — expect 4–6 weeks. If a part goes on backorder while your order is in the queue, we’ll reach out and work through discounted alternatives together.
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