Upgrade or restore your motorcycle’s engine with this Genuine Yamaha Big Bore Cylinder & Piston Kit, engineered to OEM specifications for precise fitment, durability, and reliable performance. This complete kit is ideal for riders performing an engine rebuild or replacement who demand factory-quality components and long-term reliability.
Manufactured from high-strength steel, both the cylinder barrel and piston offer excellent heat resistance, wear durability, and consistent performance under demanding riding conditions. Designed in standard/stock size, this kit is a direct replacement—no modifications required—ensuring straightforward installation and factory-correct operation. The OEM-style silver finish delivers a clean, original look that matches Yamaha factory standards.
This kit is fully compatible with Yamaha YZ125, WR125, and TE125 models from 2015 to 2019, making it a dependable solution for maintenance, repair, or engine refresh projects. Supplied as a complete ready-to-install package, it helps restore engine efficiency, compression, and overall reliability.
Backed by a 1-month seller warranty, you can install with confidence knowing you’re using genuine Yamaha components.
Genuine Yamaha OEM quality
High-strength steel construction for durability and heat resistance
Standard/stock size for direct bolt-on fitment
Helps restore engine efficiency, compression, and reliability
OEM-style silver finish for factory appearance
Yamaha YZ125 (2015–2019)
Yamaha WR125 (2015–2019)
Yamaha TE125 (2015–2019)
1 × Yamaha Cylinder Barrel (Standard / Stock Size)
1 × Piston (Standard Size)
1 × Piston Pin
1 × Set of Piston Rings
2 × Cir Clips
1 × Head Gasket
1 × Base Gasket
To ensure proper engine operation and achieve optimal performance after installation, ECU re-tuning is required. We strongly recommend professional dyno tuning (e.g., Dynojet) to ensure correct air–fuel ratios, smooth power delivery, and long-term engine reliability.
Shipping Method
Shipping is handled using standard shipping in accordance with eBay shipping policies
Tracking details will be uploaded to the eBay tracking system once dispatched
All sales are final. Any customs duties, VAT, or import taxes charged after delivery are the buyer’s responsibility
Returns or exchanges are accepted within 30 days from the date of purchase
Return shipping costs are the buyer’s responsibility, unless otherwise stated
If you face any issues with the item, please contact us first and we will be happy to assist
We aim to provide competitive and affordable pricing
1 business day after receiving cleared payment
Delivery time-frame follows eBays estimated delivery schedule
Items are packed securely using bubble wrap and a sturdy box to ensure safe delivery
A tracking number will be provided and can be tracked via the eBay system
(Applicable to selected countries such as Australia, Canada, etc.)
If your delivery address is classified as a remote area by the courier, additional shipping charges may apply
Buyers will be contacted before shipment for further discussion
You may also contact the seller before placing an order with your postcode for verification
PayPal
Credit Card
Wire Transfer
Google Pay (G Pay)
We are not responsible for import taxes or duties
Shipping labels will be completed using buyer details provided through eBay, including ID or tax number if required
If an item is detained by customs for non-tax-related reasons, a full refund will be issued
If an item arrives damaged, please provide clear photos and a full refund will be processed