Restore top-end performance with the Namura Hyperdryve Top End Kit, manufacturer part number NA-40025-4K. Designed for select Yamaha 700 ATV and side-by-side applications, this kit includes the essential components needed for a reliable piston and cylinder service. The 103.97 mm (+1.00 mm) piston specification is intended for compatible overbore applications and should be matched to the cylinder and engine configuration before installation.
The kit includes a piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit. Its hypereutectic casting process provides increased silicon content for controlled expansion, added wear resistance, and improved durability under elevated cylinder temperatures. The MOS2, or Teflon/molybdenum, coated piston skirts use a rolled-on application process designed to create a strong bond while reducing friction, improving heat transfer, and helping minimize the risk of cold seizures.
Additional piston features include machined smooth heads and anodized domes. The smooth head design helps reflect combustion heat and limit carbon buildup, while the anodized dome improves heat resistance and durability. The Namura NA-40025-4K top-end kit fits 2016–2017 Yamaha YFM700K Kodiak IRS models, 2016–2017 YFM700KP Kodiak EPS models, 2016–2017 YFM700KPS Kodiak EPS SE models, 2016 Yamaha YXE700 Wolverine models including R-Spec and R-Spec EPS, and the 2016 Yamaha YFM700G Grizzly Fi 4WD IRS. Verify model, bore size, and engine specifications before ordering.
Features:
- Complete Top End Kit: Includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 103.97 mm (+1.00 mm) Bore Size: Designed for compatible Yamaha 700 overbore applications
- MOS2-Coated Skirts: Rolled-on Teflon/molybdenum coating helps reduce friction, improve heat transfer, and minimize cold-seizure risk
- Machined Smooth Head: Helps reflect combustion heat and reduce carbon buildup
- Anodized Dome: Provides increased heat resistance and durability
- Hypereutectic Construction: Higher silicon content helps control expansion and improve wear resistance at elevated temperatures
- Fitment: Fits select 2016–2017 Yamaha Kodiak, 2016–2017 Kodiak EPS and EPS SE, 2016 Wolverine, and 2016 Grizzly Fi 4WD IRS models
- Brand and Part Number: Namura, NA-40025-4K
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