Made from 6061 aluminum and fits all Z50’s from 1968-1999
click the yellow link at the top of the page that says "Calculate Spring Rates and Display Available Springs"
You will need to either use one of Trail Bikes newly modified pistons or check your your clearances very carefully and modify your piston's reliefs to clear the bigger valves
But since the auto clutch has to stay in
Note: You will need a longer chain
Front Disc Master Cylinder Rebuild Kit - KX65 - YZ125/250 - YZ250F/450F oil Made from 6061 aluminum andMaster Cylinder Rebuild Kit Front 18 1010 Kawasaki KX125 97 00, KX250 97 00, KX65 00 18, Suzuki RM65 03 05, Yamaha WR250F 17 18, WR450F 16 18, YZ125 08 18, YZ250 08 18, YZ250F 08 18, YZ250FX 15 18, YZ250X 16 18, YZ450F 08 18, YZ450FX 16 18 Kit Contents: Cup Seal, Master Cylinder 1 Cup Seal, Master Cylinder 1 Washer 2 Boot 1 Spring 1 Snap Ring 1 Screw 2