Restore dependable top-end performance with the Namura NA-40003-4K Top End Kit, designed for OEM-style replacement on Yamaha YFS200 Blaster models from 1988 through 1997. This kit includes the piston, piston rings, wrist pin, retaining clips, top-end bearing, and gasket kit needed for a comprehensive top-end rebuild. The 66.92 mm piston size and 6.6:1 compression ratio are engineered for proper fitment and reliable operation when matched with the correct cylinder specifications.
The Namura piston features a hypereutectic casting process that increases silicon content to help control expansion, improve wear resistance, and withstand elevated cylinder temperatures. MOS2, or Teflon/Molybdenum, coated skirts are applied using a rolled-on process that creates a durable bond while reducing friction, improving heat transfer, and helping minimize the risk of cold seizures. The piston dome is anodized for increased heat resistance and durability, while the machined-smooth head helps reflect combustion heat and reduce carbon buildup.
This Namura top-end kit is intended for the following fitment: 1988–1997 Yamaha YFS200 Blaster. Verify cylinder condition, piston clearance, and application specifications before installation. The kit is supplied as a complete top-end service solution for riders and technicians seeking dependable OEM-style replacement components from a recognized powersports manufacturer.
Features:
- Complete top-end kit includes piston, rings, wrist pin, retaining clips, top-end bearing, and gasket kit
- 66.92 mm piston size with a 6.6:1 compression ratio for OEM-style replacement
- MOS2 Teflon/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 increases heat resistance and durability
- Hypereutectic casting process provides controlled expansion, increased wear resistance, and improved high-temperature performance
- Fits 1988–1997 Yamaha YFS200 Blaster models
- Brand: Namura
- Manufacturer part number: NA-40003-4K
- Vendor part number: 186-40034
Fitment:
1988 Yamaha YFS200 Blaster
1989 Yamaha YFS200 Blaster
1990 Yamaha YFS200 Blaster
1991 Yamaha YFS200 Blaster
1992 Yamaha YFS200 Blaster
1993 Yamaha YFS200 Blaster
1994 Yamaha YFS200 Blaster
1995 Yamaha YFS200 Blaster
1996 Yamaha YFS200 Blaster
1997 Yamaha YFS200 Blaster
1998 Yamaha YFS200 Blaster
1999 Yamaha YFS200 Blaster
2000 Yamaha YFS200 Blaster
2001 Yamaha YFS200 Blaster
2002 Yamaha YFS200 Blaster
2003 Yamaha YFS200 Blaster
2004 Yamaha YFS200 Blaster
2005 Yamaha YFS200 Blaster
2006 Yamaha YFS200 Blaster