Saskfarmboy... What do you feel is keeping the 9650 from more productivity?
Horsepower?...... Separation?... Shoe loss?.... Feeding?.... Decent sample?
If HP... how many hours?... could be injectors for example... a power box should improve your HP... but I wouldn't add 30%..... perhaps 15-20% as exhaust gas temps can be hard on engine life.
Separation.... Do you have cover plates on the 5th and 6th rows? This is where the return feeds back to the "tine separator".
In canola you can open the concave clearance to 50% of max if the crop is dry. If the crop has green straw add a couple filler strips to 1 and 2 ... this will let you open the concave clearance.
I am sure you had the rotor on slow speed... and increase it to 500 when the crop is tough... down to 250 when the crop is extremely dry.
Feeding.... if the accelerator belt is slipping or plugging, a heavy duty drive kit... 2 shieves and a belt.... is available. I would recommend this update for all STS's picking up heavy windrows.
Shoe loss.... I find the op manual too low for fan speed settings...esp. if the crop is dry and chaffy. Also, by opening the concave and reducing the rotor speed the shoe load can be lessened.
We replace our precleaner with an adjustable precleaner and have never had it wide open in our crops. In fact for canola, flax and canary seed we run it only 2 turns open ... and our productivity, sample cleanliness and shoe loss are greatly improved. The return volumes also decreased significantly... if the monitor reading is accurate!
BTW... in wheat it eliminated most of the unthrashed heads and whitecaps at about 1/2 open.
Happy harvesting.... Bill