Yak 50 / CJ Cooling Gill Louver Axle rework kit
This kit includes a re-usable plastic drill bushing template (plus three steel bushings with lock nuts) to repair Cooling Gills that have excessive movement because of wear in their axle support holes.
This template will accurately locate the center of the Gill Vane Axle before damage occurred.
After removing several Gills either side of the damaged location, lock your template in position.
Do this by pressing two of the short M4 Gill Vane Positioning Screws you just removed through the two smaller holes in the template and into aligned holes beneath.
A fence molded in to the template ensures correct edge distance.
These hardened drill bushings will keep your 5/16” diameter drill bit centered and on a true perpendicular axis. Remember to remove material with the least drill pressure required because the plastic template may soften if excess heat is generated.
Insert the hex head of the new axle support bushing next to the lower end of the Gill Vane and secure the bushing on its far side with the MS21042-4 locknut supplied.
Use a 100 degree piloted countersink to prepare the outer fishplate for the newer Yak 52 style Axle that has a slotted countersunk head.
Installing these bushings with a Yak 52 style axle eliminates the lower double locknuts which are difficult to adjust - creates a robust bearing surface between the aluminum ring and the new steel bushing and provides easy axle tension adjustment using a flat blade screwdriver.