The Namura NA-40025-2K Hyperdryve Top End Kit is designed for select Yamaha 700cc ATVs and side-by-side vehicles requiring a reliable replacement piston assembly. This complete kit includes the piston, piston rings, wrist pin, circlips, top-end bearing, and gasket kit, providing the primary components needed for a top-end rebuild. The piston is manufactured for a 0.020-inch oversize application and is intended for properly prepared cylinders matching the required specification.
Namura Hyperdryve technology combines a hypereutectic casting process with performance-focused piston treatments. The higher silicon content helps control expansion, improve wear resistance, and support operation at elevated cylinder temperatures. MOS2, or Teflon/molybdenum, coated skirts use a rolled-on application process to create a strong coating bond that helps reduce friction, improve heat transfer, and minimize the risk of cold seizures. Machined smooth piston heads help reflect combustion heat and reduce carbon buildup, while anodized domes provide increased heat resistance and durability.
This Namura top-end kit fits select 2016–2017 Yamaha YFM700K Kodiak IRS models, including Kodiak EPS and Kodiak EPS SE versions. It also fits the 2016 Yamaha YXE700 Wolverine, Wolverine R-Spec, Wolverine R-Spec EPS, and YFM700G Grizzly Fi 4WD IRS. Confirm the vehicle model, year, cylinder condition, and oversize requirement before installation. Manufacturer part number NA-40025-2K and vendor part number 186-40252 identify this kit.
Features:
- Complete top-end kit includes piston, rings, wrist pin, circlips, top-end bearing, and gasket kit
- 0.020-inch oversize piston design for compatible, properly machined cylinders
- MOS2 Teflon/molybdenum coated skirts help reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined smooth piston head helps reflect combustion heat and reduce carbon buildup
- Anodized dome improves heat resistance and piston durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance
- Fits select 2016–2017 Yamaha Kodiak 700 IRS models and 2016 Yamaha Wolverine and Grizzly 700 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