XS650: High Ratio Primary Gears   Leave a comment

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

 

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