After handling related modifications this, to me, this makes good sense. Self-adjusting. Direct. Simple.

The first ones I saw were Kawasaki GPZ slave cylinders and matching master cylinders. Easy. Cheap. Effective. Means modifying the left hand engine cover. Opening out the hole. Sanding a flat spot on the case outside. Drilling for mount screws. Making an adapter for the push rod. Install. Bleed. Check. Use. A day-no problems.

 

GPZ900 slave cylinder

 

I have a unit that bolts directly into the left case. No modifications. Push rod adapter required.

 

VA (stainless steel) slave cylinder … using tidily small KTM master cylinder … bolts into original case … here it_s test mounted to an old cover that was just hangin around (actually i was about to use the cover as a test mount for a KTM slave cylinder)

 

 

slave cylinder … from inside case

 

 

setting up a KTM slave cylinder

 

Or this one. Hidden inside the case.

 

 

slave cylinder hidden inside the case … FZR master cylinder

 

 

from outside

 

 

slave cylinder

 

 

 

 

 

Years ago Tony Hall used to produce these. They became harder to find than chicken lip-socks (rarer than hen’s teeth). Ivan Hoey (Australia) began producing these once more some years ago. Fits direct to the original clutch basket.

I scored a set and have been running them ever since. Love them. 3 fewer teeth on the primary gear, 5 more on the drive gear. Increases the transmission output while decreasing crank rotation.

Original        … 27:72 … 2.66

Ivan +20%  … 32:69 … 2.16

Together with Terry’s vescanite clutch dampers. The vescanite dampers don’t break like the springs.

Two of the better modifications I’ve done.

 

original primary gear … with vescanite dampers

 

 

 

high ratio primary gears … with vescanite dampers

 

Ivan has just produced a new batch. Improved. The inner bush has been replaced with a needle bearing.

 

Ivan’s new set … + needle bearing

 

This is a small run. If interested he is now taking orders. Requires a deposit. Email contact here … ltr.management@bigpond.com

He can also do a needle bearing conversion on your stock primary gears. Dramatically improves gear and neutral selection. Also when stationary.

Includes needle, inner and thrust races, thrust washer, 3x screws/nuts and fitting instructions.

 

convert original primary gears to needle bearing