Upgrade the top-end performance of your Honda ATV with the Cylinder Works 11005-K01 Big Bore Cylinder Kit. Designed for a 99.00 mm bore and 12.0:1 compression ratio, this complete kit provides a reliable replacement and performance-focused solution for compatible Honda TRX450R and TRX450ER engines. The kit includes the cylinder, piston kit, and required gaskets for a comprehensive installation.
The Cylinder Works cylinder is engineered to look similar to the original equipment cylinder while using a nickel silicon carbide plating process for enhanced durability and extended service life. The piston is matched to the cylinder to support longevity, consistent performance, and reduced engine noise. No machining is required for installation when used with the appropriate compatible application and components.
Fitment includes 2006–2009 and 2012–2014 Honda TRX450ER Electric Start models, along with 2006–2008 Honda TRX450R models. Verify the model year and engine configuration before ordering. Cylinder Works replacement pistons, gasket sets, and ring sets are also available separately for future maintenance. The included top-end gasket kit does not include valve stem seals.
Manufacturer: Cylinder Works. Vendor part number: 11005-K01. This kit is intended for compatible Honda TRX450R and TRX450ER applications requiring a big bore replacement cylinder assembly.
Features:
- Bore Size: 99.00 mm, equivalent to approximately 3.90 inches
- Compression Ratio: 12.0:1 for enhanced engine performance
- Kit Contents: Includes cylinder, piston kit, and gaskets
- Cylinder Construction: Nickel silicon carbide plated for improved durability and longer service life
- Piston Matching: Matched Vertex piston supports longevity, performance, and reduced engine noise
- Installation: No machine work required for compatible applications
- Appearance: Cylinder is designed to closely resemble the stock unit
- Fitment: Compatible with 2006–2009 and 2012–2014 Honda TRX450ER Electric Start models
- Fitment: Compatible with 2006–2008 Honda TRX450R models
- Replacement Support: Replacement pistons, gaskets, and ring sets are available
- Gasket Note: Top-end gasket kit does not include valve stem seals
- Brand: Cylinder Works
- Manufacturer Part Number: 11005-K01
- Vendor Part Number: 11005-K01
Fitment:
2006 Honda TRX450ER Electric Start
2006 Honda TRX450R
2007 Honda TRX450ER Electric Start
2007 Honda TRX450R
2008 Honda TRX450ER Electric Start
2008 Honda TRX450R
2009 Honda TRX450ER Electric Start
2009 Honda TRX450R
2010 Honda TRX450ER Electric Start
2011 Honda TRX450ER Electric Start
2012 Honda TRX450ER Electric Start
2012 Honda TRX450R
2013 Honda TRX450ER Electric Start
2013 Honda TRX450R
2014 Honda TRX450ER Electric Start
2014 Honda TRX450R