Restore dependable top-end performance with the NAMURA Hyperdryve Top End Kit, manufacturer part number NA-40025K. This kit is designed for select Yamaha 700cc ATV and UTV applications and includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit required for a comprehensive top-end service. The standard-bore piston is engineered for reliable fitment and consistent performance in compatible engines.
Featuring MOS2, or Teflon and molybdenum, coated skirts, the piston uses a rolled-on coating process that creates a stronger bond than conventional spray-on applications. The coating helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. Machined-smooth piston heads help reflect combustion heat and reduce carbon buildup, supporting piston protection, performance, and fuel efficiency.
The anodized piston dome improves heat resistance and durability, while the hypereutectic casting process provides increased silicon content for controlled expansion, enhanced wear resistance, and reliable operation at higher cylinder temperatures. These features make the NAMURA Hyperdryve kit a practical choice for replacing worn top-end components during engine maintenance or repair.
Fitment includes select 2016–2017 Yamaha YFM700K Kodiak IRS models, YFM700KP Kodiak EPS models, YFM700KPS Kodiak EPS SE models, and the 2016 Yamaha YXE700 Wolverine, Wolverine R-Spec, and Wolverine R-Spec EPS. It also fits the 2016 Yamaha YFM700G Grizzly Fi 4WD IRS. Verify the exact year, model, engine configuration, and standard-bore requirements before installation.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- MOS2 Teflon and molybdenum coated skirt helps reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined-smooth piston head helps reflect combustion heat and reduce carbon buildup
- Anodized piston dome improves heat resistance and durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance
- Standard-bore design for select Yamaha 700cc engines
- Brand: NAMURA
- Manufacturer part number: NA-40025K
- Vendor part number: 186-4025
- Fits select 2016–2017 Yamaha Kodiak, 2016 Yamaha Wolverine, and 2016 Yamaha Grizzly Fi 4WD IRS models
Fitment:
2016 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2016 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2016 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2016 Yamaha YFM700K Kodiak [IRS]
2016 Yamaha YFM700KP Kodiak EPS [IRS]
2016 Yamaha YFM700KPS Kodiak EPS SE [IRS]
2016 Yamaha YXE700 Wolverine
2016 Yamaha YXE700 Wolverine R-Spec
2016 Yamaha YXE700 Wolverine R-Spec EPS
2017 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2017 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2017 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2017 Yamaha YFM700K Kodiak [IRS]
2017 Yamaha YFM700KP Kodiak EPS [IRS]
2017 Yamaha YFM700KPS Kodiak EPS SE [IRS]
2017 Yamaha YXE700 Wolverine
2017 Yamaha YXE700 Wolverine EPS
2017 Yamaha YXE700 Wolverine R-Spec
2017 Yamaha YXE700 Wolverine R-Spec EPS
2017 Yamaha YXE700 Wolverine R-Spec EPS SE
2018 Yamaha YFM700F Grizzly Fi 4WD EPS LE [IRS]
2018 Yamaha YFM700F Grizzly Fi 4WD EPS SE [IRS]
2018 Yamaha YFM700F Grizzly Fi 4WD EPS [IRS]
2018 Yamaha YFM700K Kodiak [IRS]
2018 Yamaha YFM700KP Kodiak EPS [IRS]
2018 Yamaha YFM700KPS Kodiak EPS SE [IRS]
2018 Yamaha YXE700 Wolverine
2018 Yamaha YXE700 Wolverine R-Spec EPS
2018 Yamaha YXE700 Wolverine R-Spec EPS SE