This standard-size piston ring kit is designed for 450-class single-cylinder four-stroke ATV engines, delivering a reliable seal and restored compression where wear has allowed blow-by to steal power. It covers 2003–2014 model years across popular 450-class platforms, delivering stock-fitment performance at a value price. Replacing worn rings with this aftermarket set helps reduce oil consumption and revives overall engine response on rugged trails or demanding farm work. This aftermarket replacement is built to durable, service-friendly standards, focusing on the wear-and-tear realities of four-stroke, single-cylinder powerplants. It provides a dependable, cost-conscious path to restore compression and throttle response without the downtime or cost of OEM parts, making it a solid choice for trail riders and farm operators who demand consistent, ship-ready performance.

Comprehensive Vehicle Fitment

Manufacturer	Models / Series	Years / Details
Yamaha	YFM450FA	Kodiak 450 Series, 2003–2006
Yamaha	YFM450FG	Kodiak 450 Series, 2007–2014
Yamaha	YFM450FX	Kodiak 450 Series, 2006–2010
Yamaha	YXR450F	Rhino 450 Series, 2006–2009

Product Specifications

Attribute	Details
OEM Reference Part Numbers	5ND-11603-00-00 (primary); 5TG-11603-00-00 (alternate OEM reference)
Type	Piston Ring Kit (Standard size)
Manufacturer	Aftermarket Replacement
Application	YFM450 Kodiak / YXR450F engines (2003–2014)
Material	Standard-grade steel/cast-iron ring elements
Ring Configuration	2 x Compression Rings + 1 x Oil Ring
Bore Size	Standard (OEM-spec bore for YFM450/YXR450F; matches stock piston bore)
Piston Count	1 piston (ring kit designed per-piston, for one cylinder)
Packaging	Single kit per box (rings for one piston)

OEM & Aftermarket Cross-Reference Information

Part Number	Brand / Type	Cross-Reference Notes
5ND-11603-00-00	OEM Yamaha	Primary OEM piston ring set for YFM450F/YXR450F; standard size
5TG-11603-00-00	OEM Yamaha	Alternate OEM reference used on related Yamaha lines; cross-reference to 5ND-11603-00-00
51-548	WSM (Aftermarket)	Standard-size ring set; cross-reference for Yamaha 450 models (bore approx. 78mm in some listings)

What's Included

This kit contains the essential piston rings needed to restore compression on the Yamaha YFM450/YXR450F engines.

• Top Compression Ring
• Second Compression Ring
• Oil Ring

Note: Other engine components such as pistons, circlips, and gaskets are not included with this kit.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely engineered to match stock bore and ring profiles for 450-class engines, ensuring reliable compression restoration.
• OEM Cross-Reference: Aligns with standard Yamaha references while offering a cost-effective aftermarket alternative.
• Premium Materials (for this part type): Robust steel/cast-iron ring elements designed for durability and predictable break-in.
• Performance Restoration: Restores original compression, reduces oil blow-by, and revives throttle response on tough terrain.
• Per-Piston Design: One kit pairs with a single piston, simplifying installation and ensuring correct ring geometry for each cylinder.
• Trail- and Farm-Ready Reliability: Built to handle rugged conditions, helping you keep moving when the job calls for it.

Installation Notes:

• Ensure the engine is cool and clean before starting. Remove any old ring debris from the groove lands.
• Verify bore size and confirm standard-size rings are correct for the piston to avoid a tight or loose fit.
• Use a proper ring compressor to install rings evenly without bending or nicking ring lands.
• Lubricate the rings and cylinder walls with clean assembly oil or lubricant prior to installation.
• Install rings with correct orientation (keep ring markings facing up) and stagger end gaps to avoid coincidence with the other rings.
• After assembly, perform a cautious break-in procedure and verify compression with a gauge before returning to service.

Why Upgrade?

Running a worn piston ring set leads to compression loss, increased oil blow-by, higher oil consumption, and diminished power, especially under load. Replacing with this standard-size ring kit restores the original seal and reliable performance, returning the engine to predictable power and efficiency for demanding trails or field work.