Description:

In a CV carburetor, the diaphragm seals the vacuum chamber and allows pressure differences to move the vacuum piston or slide. A torn, pinholed, stiff or poorly seated diaphragm can keep the slide from rising correctly, causing hesitation, weak acceleration or loss of power. Seat the outer lip evenly in the carburetor body groove during installation.

Replaces OEM #3F7-14940-00

• Allows the vacuum piston or slide to respond to pressure changes
• Helps correct poor response when diaphragm damage is the cause
• Inspect for pinholes and seat the outer lip evenly during installation

Fits

• 1978-1984 Yamaha XS650
• 1980-1982 Yamaha SR250
• 1980-1983 Yamaha XS400