Restore dependable top-end performance with the NAMURA NA-40013K Hyperdryve Top End Kit, designed for select Yamaha 700cc powersports applications. This complete kit includes a piston, piston rings, wrist pin, wrist-pin clips, top-end bearing, and gasket kit for a convenient replacement solution. The kit is designed for standard-bore fitment and supports reliable engine service on compatible Yamaha Viking, Grizzly, and Raptor models.
The Hyperdryve piston features MOS2, or Teflon/Molybdenum, coated skirts applied through a rolled-on process. This creates a strong coating bond that helps improve heat transfer, reduce friction, and minimize the risk of cold seizures. The machined smooth head reflects combustion heat and helps reduce carbon buildup, supporting piston protection and consistent engine operation.
Anodized piston domes increase heat resistance and durability, while the hypereutectic casting process adds silicon for controlled expansion, improved wear resistance, and greater tolerance of elevated cylinder temperatures. These features make the NAMURA NA-40013K a practical choice for rebuilding the top end of compatible Yamaha engines while maintaining dependable fit and performance.
Fitment includes the 2014–2018 Yamaha YXM700 Viking, the 2014–2015 Yamaha YFM700G Grizzly Fi 4WD with IRS, and the 2015–2017 Yamaha YFM700R Raptor, subject to the applicable standard-bore configuration. Verify the model year, engine specifications, and existing piston and cylinder measurements before installation. Manufacturer part number: NA-40013K. Vendor part number: 186-4013.
Features:
- Complete top-end kit: Includes piston, rings, wrist pin, clips, top-end bearing, and gasket kit
- MOS2-coated piston skirts: Rolled-on Teflon/Molybdenum coating helps improve heat transfer, reduce friction, and minimize cold-seizure risk
- Machined smooth piston head: Reflects combustion heat and helps reduce carbon buildup for added piston protection
- Anodized piston dome: Improves heat resistance and durability compared with non-anodized piston designs
- Hypereutectic casting process: Provides higher silicon content for controlled expansion, added wear resistance, and improved high-temperature durability
- Standard-bore fitment: Designed for select Yamaha 700cc Viking, Grizzly, and Raptor applications
- Manufacturer part number: NAMURA NA-40013K
- Vendor part number: 186-4013
Fitment:
2014 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2014 Yamaha YXM700 Viking
2015 Yamaha YFM700G Grizzly Fi 4WD [IRS]
2015 Yamaha YFM700R Raptor
2015 Yamaha YXM700 Viking
2016 Yamaha YFM700R Raptor
2016 Yamaha YXM700 Viking
2017 Yamaha YFM700R Raptor
2017 Yamaha YXM700 Viking
2018 Yamaha YFM700R Raptor
2018 Yamaha YXM700 Viking