We machine a new "83" Kawasaki primary clutch with our overdrive modification for more top end speed and lower RPMs at cruising speeds, From the factory the belt on the KRX Primary clutch lacks about a 1\2” from traveling all the way to the top of the primary clutch sheaves, this and other design flaws cause the KRX clutch to be fully shifted to its highest ratio by 45 mph, we increase the axial travel of the belt in the sheaves to achieve a higher final ratio and move that full shift out point to 60 mph, this also increases top speed, lowers cruising RPMs, allows for better fuel economy, and can help prevent premature wear on the weights and sheaves.
There is absolutly no loss of low end power with our mod, as a matter of fact you will gain 11% of low end gearing on the bottom end.
Fuel consumption is reduced due to the machines ability to run at a lower RPM. 
With this "overdrive" modification we are able to run upto 40mph in low range.
We have customers hitting 76 mph with stock machines and 87 mph with supercharged machines, the lighter and more powerful your machine the higher top speed you will be able to achieve. (weight is horsepower) 
New Heavy Duty Circlips, Lighter Clutch Spring, Titanium spacers to prevent the weights from wearing into the weight pockets, and Chromoly Pressure Place Self Centering bolts are included with this service, this new clutch comes with new factory weights but can be upgraded to KWI weights and rollers.
Purchasing a new Primary with the Overdrive Mod done from us saves you shipping your old primary to us. 
 
We can upgrade the new clutch to KWI adjustable weights and rollers for $500 additional