CYLINDER KIT 02-18 YZ85 52.50mm, WORKS CYLINDER 21007-K01 BIG BORE
4.1 Trustpilot 99.9% positive on eBay
Free UK delivery 2–4 business days
Spread the cost with 
18+, T&Cs apply
Cylinder Works Big Bore Complete Cylinder Kit, 52.50mm bore size, increases displacement to 103.5cc. This kit offers direct bolt-on installation with no re-plating necessary. The cylinder features Nickel Silicon Carbide plating for enhanced durability and is precision honed for easy piston installation. Cylinder head modification is required for proper fitment. Included items are the cylinder, piston, piston pin, two circlips, piston ring, and a gasket set. Bore is +5mm. Uses Vertex Piston #23628.
- SKU
- 56-K154.525.CKW
- Brand
- Cylinder Works
- Availability
- In Stock (1)
Fitments (18)
| Make | Model | Year |
|---|---|---|
| YAMAHA | YZ 85 | 2002 |
| YAMAHA | YZ 85 | 2003 |
| YAMAHA | YZ 85 | 2004 |
| YAMAHA | YZ 85 | 2005 |
| YAMAHA | YZ 85 | 2006 |
| YAMAHA | YZ 85 | 2007 |
| YAMAHA | YZ 85 | 2008 |
| YAMAHA | YZ 85 | 2009 |
| YAMAHA | YZ 85 | 2010 |
| YAMAHA | YZ 85 | 2011 |
| YAMAHA | YZ 85 | 2012 |
| YAMAHA | YZ 85 | 2013 |
| YAMAHA | YZ 85 | 2014 |
| YAMAHA | YZ 85 | 2015 |
| YAMAHA | YZ 85 | 2016 |
| YAMAHA | YZ 85 | 2017 |
| YAMAHA | YZ 85 | 2018 |
| YAMAHA | YZ 85 | 2019 |
- General Product Group
- Engine
- General Product Type
- Cylinder Kits
- General Size
- 50mm
- Variant Id
- 283300
FULL DESCRIPTION
Cylinder Works Big Bore Complete Cylinder Kit - 103.5cc
Enhance your motorcycle's performance with this complete Big Bore Cylinder Kit from Cylinder Works. Designed for a significant displacement increase, this kit upgrades your engine to 103.5cc, offering a substantial boost in power and torque. This kit is engineered as a direct bolt-on upgrade, simplifying installation without requiring additional machining services.
The cylinder features a durable Nickel Silicon Carbide plating, providing exceptional wear resistance and a longer lifespan. It is precision honed to exact specifications for a perfect fit and easy piston installation. This kit includes all the necessary components to complete the upgrade, ensuring a comprehensive solution for performance enthusiasts.
Key Features:
- Increases engine displacement to 103.5cc for enhanced power.
- Direct bolt-on design for straightforward installation.
- Nickel Silicon Carbide plated cylinder for superior durability.
- Precision honing ensures an easy piston fit.
- Includes all essential components for a complete installation.
- Important Note: Cylinder head modification is required for proper fitment.
Included Components:
- Cylinder
- Piston
- Piston pin
- Circlips (x2)
- Piston ring
- Gasket set
Specifications:
- Bore Size: +5mm
- Total Displacement: 103.5cc
- Compression Ratio: Standard
- Designed to use Vertex Piston #23628
QUESTIONS? JUST ASK
Talk to John or Phil. Real people, Monday to Friday, 10:00 to 17:00.
Check the fitment table on this page against your make, model and year. Not sure? Call or email us 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.