Complete Yamaha YZ125/YZ125X Top End Rebuild Kit Cometic & Wiseco Piston Powered

Complete Yamaha YZ125/YZ125X Top End Rebuild Kit Cometic & Wiseco Piston Powered

845M05400, PK1571, CW20011, B1001, C3105, 1C3-11311-21-00, 1C3-11311-00-00, 1C3-11631-03-B0, 1C3-11631-03-A0, 1C3-11311-2100, 1C3-11631-01-D0, 1C3-11631-03-D0, 93450-16812-00, 93450-16068-00, 93310-21510-00, P400485100030, 8055681301023, S4C05800001B, 810641, NX-40009T, P4004855600118, RE905M05400, 846M05400

Complete Yamaha YZ125X Top End Rebuild Kit - Wiseco Performance Parts

Restore peak power to your Yamaha YZ125 (2005-2021) or YZ125X (2000–2022) with the Wiseco-powered Top End Rebuild Kit. Includes forged piston, Cometic gasket, and stock bore cylinder for maximum durability and performance

Fits Yamaha YZ125 2 Stroke Dirt Bikes

Years 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021

Also Fits Yamaha YZ125X Years 2020 2021 2022

High-Performance Wiseco Forged Piston: Built for Power

At the heart of this top-end rebuild kit is the Wiseco Pro-Lite Forged Piston Kit. Known for unmatched strength and reliability, Wiseco pistons are lightweight yet incredibly robust, delivering increased horsepower and maximum durability under extreme stress. Paired with high-quality piston rings and wrist pins, your Yamaha YZ125 will roar back to life with heightened responsiveness and power output.

Why This Top End Kit Dominates:

Aftermarket 54mm Stock Bore Nikasil Cylinder: Highly durable, extends cylinder life significantly, and delivers reliable performance even under heavy motocross or trail use.
Forged pistons resist wear and withstand high temperatures better than cast pistons.
Improved compression seal for more consistent power delivery.
Includes piston, pin, rings, and retaining clips—all built for high-performance applications.
Cometic gaskets ensure a perfect seal for long-term reliability.
One-year warranty gives you peace of mind that you're investing in a premium product.*

BPRATV - The Best Parts. The Best Performance. The Best Price.
BRAPPPPPPPPPP!
5MV-11111-00-00 5HD-1131D-10-00 5HD-1132D-10-00 5NY-11311-11-00 90116-08394-00 93210-63442-00 90201-080L8-00 90176-08026-00 4XM-11633-10-00 5NY-11611-00-00 5NY-11631-01-A0 5NY-11631-01-B0 5NY-11631-01-C0 5DH-11351-01-00 90116-08318-00 90116-08388-00 99590-10114-00

DO YOU NEED TO HAVE THIS ITEM INSTALLED ON YOUR VEHICLE? WE HAVE YOU COVERED! CONTACT US FOR DETAILS

We are BPRATV, offering you the best in parts and service for over 20 years. If you need your vehicle repaired, parts, or you just have technical questions call, email, or come see us at our Upland, CA location Mon to Fri 7 am to 4 pm, PST. We accept payment via credit card, PayPal, Venmo, Cash App, and in person via cash or check (once cleared).

PRICES AND LISTINGS ARE SUBJECT TO CHANGE AT ANY TIME WITHOUT NOTICE.

REPAIR SHOPS AND DEALERS CONTACT US TO SET UP AN ACCOUNT AND GET A DISCOUNT ON ALL YOUR ORDERS

WE SHIP WORLDWIDE AND WE PROCESS ORDERS 7 DAYS A WEEK. TAMBIEN HABLAMOS ESPANOL!

*Interchangeable part: We stock the same parts from different manufacturers so that when back orders occur, we have a part that is equal in quality and cost to send, preventing what can sometimes be long waits. This would be the only reason your order might vary slightly from the description, and the part that is subbed will always be comparable quality. If you only want a specific brand, just ask and we will let you know if it is out of stock and for how long.

**Returns: We accept returns for part or all of your order within the first 30 days. Refunds are only granted for parts that are returned 100% complete, brand new, in the original packaging. Once a part has been installed or prepped for installation it is no longer eligible for return.

**Warranty: This product is NOT DIY. Over 99% of people in the world are not qualified to build an engine, and it is the responsibility of the person assembling and tuning the engine to make sure all the parts are correct and work properly. We ALWAYS STRONGLY recommend work be done by a qualified, experienced mechanic. For any warranty to be considered the part(s) in question must be sent back to us for inspection, NO EXCEPTIONS. We cannot warranty anything based on photos, emails, phone calls, what you read online alone, or what another mechanic says the problem is alone. Warranty does not cover any failure that is a result of improper installation, tuning, break-in, lack of maintenance, or misuse.

Feedback: Positive feedback is greatly appreciated. We work very hard to maintain a high feedback rating, and we want all of our customers to be happy. Receiving positive feedback when an order goes the way it is supposed to is a huge help. If you do not feel we deserve positive feedback PLEASE contact us prior to leaving feedback and we will do what is needed to help you feel as "positive" as possible about your experience. Please work with us and we will ALWAYS work with you.

Cub cylinder warranty: All CP Industries Yamaha Banshee Monoblock cylinders purchased from BPRATV come with a LIFETIME WARRANTY. If the cylinder you purchased from us fails for any reason that is not related to improper installation, tuning, break-in, lack of maintenance, or abuse we will either have it REPAIRED OR REPLACED FREE OF CHARGE. The cylinder must be sent back with proof of purchase for inspection by us and Millennium Technologies (NO EXCEPTIONS). The warranty is for the cylinder only. No other parts nor any labor are included. The warranty cannot be converted to a discount or refund, nor will a reparable cylinder be exchanged for a new one. The warranty applies to the original owner of the cylinder only. The warranty does not cover any failure that is a result of improper installation, tuning, break-in, maintenance, or misuse. For any warranty to be considered the part(s) in question must first be sent back to us for inspection, NO EXCEPTIONS. We do not warranty parts based on phone calls, photos, emails, what you read online, or another mechanic's assessment alone.

We are BPRATV, and we offer a huge selection of Titanium fasteners. Call, email, or visit us at our Upland, CA location Monday to Friday, 7 am to 4 pm, PST.

Returns: We accept returns within 30 days. You can return all or part of your order, as long as any items for which a refund is requested are returned to us brand new, never used, in the original packaging. Once an item has been used (or prepped for use with lubricants, sealant, etc.) it is not eligible for return.

*If a Ti fastener purchased from us fails for any reason during use it will be replaced with a new one. The warranty cannot be converted to a refund or discount of any kind, and the warranty does not cover any failure that is a result of improper installation or misuse. For any fastener to be covered by warranty it must first be sent to us for inspection. We do not warranty parts based on phone calls, photos, emails, what you read online, or what another seller, mechanic, or technician claims the issue is.