The seals inside the master cylinder build and hold brake pressure. As they swell or harden with age, the lever turns spongy or slowly sinks toward the bar while braking fades. This kit reseals the cylinder and restores a firm lever and reliable pressure. Confirm your bore size before ordering so the seals match.

Replaces OEM #1FK-W0042-50

• Reseals the master cylinder
• Cures a spongy or sinking lever
• Confirm bore size before ordering

Fits

• 1991-1996 Yamaha WR250Z
• 1996-1999, 2001 Yamaha XVZ1300
• 2002-2003 Yamaha XV1700PC