BOYESEN REEDS 640R YZ250 78-82, BR001640 Fuel Tanks & Tank Foams Viscosity at 100°C: 21

Viscosity at 100°C: 21

7mm Exhaust Duration (@1mm): 248 degrees Lobe Center: 104 degrees Valve Lash:

Keep the contents of your OGIO No Drag Mach Backpack dry with this waterproof cover

With removable plastic inside tool tray

BOYESEN REEDS 640R YZ250 78-82, BR001640 Fuel Tanks & Tank Foams Viscosity at 100°C: 21Boyesen Power Reeds 640 Improves throttle response and fuel economy, enhances acceleration and top end speed Revolutionary dual stage reeds outperform and outlast any stock reed Yamaha IT250 1977 1983 IT400 1979 IT425 1980 IT465 1981 1982 IT490 1983 1984 YZ250 1978 1989 YZ250WR 1989 YZ400 1979 YZ465 1980 1981 YZ490 1982 1983 Part No. 05 640 (oro2u. com)