This 0.50 mm oversize piston ring kit is a three-ring set designed for high-hour 450cc four-stroke ATV/UTV engines from 2003 through 2014. It restores peak compression and crisp throttle response by renewing worn ring lands, helping to curb oil consumption and restore power on rugged trails or farm routes. As an aftermarket replacement, it delivers OEM-like sealing performance and durable wear resistance at a value-driven price point. This aftermarket kit targets common wear issues caused by long-term off-road use—ring erosion, blow-by, and oil fouling—that creep into 450cc engines under tough conditions. It provides a direct-fit solution with standard coatings and proven materials, giving riders a dependable rebuild option that supports steady, reliable power on every ride.

Comprehensive Vehicle Fitment

Manufacturer	Models / Series	Years / Details
Yamaha	YFM450FA	2003-2006
Yamaha	YFM450FG	2007-2014
Yamaha	YFM450FX	2006-2010
Yamaha	YXR450F	2006-2009

Compatibility notes based on OEM references and widely used aftermarket listings confirm fitment across the popular 450cc ATV/UTV platforms in the 2003–2014 window.

Product Specifications

Attribute	Details
OEM Reference Part Numbers	5ND-11605-00-00
Type	Piston Ring Set
Manufacturer	Aftermarket Replacement
Application	YFM450FA/YFM450FG/YFM450FX/YXR450F (2003-2014)
Oversize	0.50 mm
Ring Count	3 rings (Top compression ring, Second compression ring, Oil control ring)
Material	Steel alloy / cast iron substrate with standard ring coatings

Cross-reference context: the OEM Yamaha part number 5ND-11605-00-00 is widely cited for these models, with aftermarket cross-references aligning on the same OS 0.50 sizing and three-ring design.

OEM & Aftermarket Cross-Reference Information

Part Number	Brand / Type	Cross-Reference Notes
5ND-11605-00-00	Aftermarket Replacement	OEM Yamaha part number; compatible with Yamaha YFM450FA/FG/FX and YXR450F engines; oversize 0.50 mm kit

This cross-reference aligns the OEM reference with reliable aftermarket options that maintain correct dimensions and sealing performance for the listed models.

What's Included

This kit includes the essential piston rings required to rebuild the piston assembly for the listed Yamaha 450 engines:

• Top Compression Ring
• Second Compression Ring
• Oil Control Ring

Note: Gasket sets, circlips, and piston pins are not included unless specified separately.

Why Choose This Aftermarket Replacement?

• Direct-Fit Compatibility: Precisely sized 0.50 mm rings to fit the listed 450cc engines without modifications.
• OEM Cross-Reference: Backed by the OEM part number 5ND-11605-00-00 for reliable dimensions and fitment.
• Premium Materials (engine-grade): Built from durable steel alloy/cast iron substrates designed to withstand combustion heat and wear.
• Performance Restoration: Restores compression, reduces blow-by, and helps curb oil consumption for crisp throttle response and stronger power delivery.
• Cost-Effective Alternative: A value-driven option that delivers OEM-standard performance outside of dealer pricing.
• Long-Term Reliability: Engineered for rugged off-road use, helping maintain service intervals and reliability on trails and farms.

Installation Notes:

• Thoroughly inspect the piston and bore for wear; replace if bore is scored or out of round before installing new rings.
• Clean the ring grooves and piston lands carefully; remove all carbon and debris to ensure proper seating.
• Orient rings correctly: top compression ring with the marked side facing upward; install the oil control ring with its dampener/rails oriented per the groove design.
• Check ring end gaps using a feeler gauge and ensure gaps meet manufacturer specs for the specific bore size.
• Lightly lubricate the rings and piston with clean engine oil before assembly to prevent dry start on initial startup.
• After installation, perform a careful break-in procedure per the engine’s service manual, avoiding extended high-RPM operation for the first hours of runtime.

Why Upgrade?

Running a worn piston-ring set in these 450cc engines leads to loss of compression, higher oil consumption, and diminished throttle response. This replacement restores sealing performance, improves power and consistency, and helps protect the engine from long-term wear by renewing the critical ring surfaces and land interfaces.