PISTON KIT YZ125 1985 58.00mm, WISECO 521M05800 YAMAHA
4.1 Trustpilot 99.9% positive on eBay
Free UK delivery 2–4 business days
Spread the cost with 
18+, T&Cs apply
Wiseco Piston Assembly 521M05800. This piston kit has a bore size of 58.00mm. The kit includes two CW16 circlips and one S270 wrist pin. Power valve must be modified for .040 and larger. Top-end bearing available separately, part number B1016. Wiseco forged pistons are superior in strength and design. Sold by application and bore size; standard and oversizes are not indicated.
- SKU
- 56-W521+2.00
- Brand
- Wiseco
- Availability
- In Stock (2)
- General Product Group
- Engine
- General Product Type
- Pistons & Kits
- General Size
- 58mm
- Variant Id
- 256686
FULL DESCRIPTION
Wiseco Piston Assembly for Yamaha YZ125
This high-quality Wiseco forged piston assembly is designed to provide superior strength and performance for your Yamaha YZ125. Wiseco pistons are engineered for durability and are a top choice for demanding applications.
This kit includes:
- One Wiseco forged piston
- Two CW16 circlips
- One S270 wrist pin
Important Note: Modifications may be required for the power valve on certain applications. Please consult your service manual or contact technical support if you have questions regarding fitment or installation. This piston is sold by application and bore size. Ensure you order the correct standard or oversize bore size for your specific needs.
Features:
- Forged construction for enhanced strength and durability
- Designed for optimal performance
- Includes all necessary components for installation (piston, wrist pin, circlips)
- Direct replacement for specified applications
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.
Call or email us with your make, model and year and we will check it for you before you order.
UK delivery is £4.99, or free on orders over £60. Orders ship within 3 working days, then delivery takes 2–4 business days. Delivery details
Yes. You have 14 days from delivery to return it, unused and in its original packaging. Contact us first and we will send you the return instructions. Returns policy
By card, PayPal, Apple Pay or Google Pay, or spread the cost with Klarna. Payment is taken securely by Stripe, and the options for your order are shown at checkout.
More answers in our FAQ.
Trade pricing available
Buying parts for your business? Apply for a 2BrosParts trade account.