Here is a sled that started out over 11.6" center to center and .110" of lead in. With all the motors I have checked, only one was within Polaris spec.
Started doing this with the delivery of the 2011 Pro. Thousands of miles without any bolt or strap failures to date.
This is a simple explanation of the process.
Booth straps were drilled out to .500". Straps are then mounted back on the engine loosely, followed by mounting the motor back into the chassis. Torque up the motor mount bolts and torque arm. This will put the motor straps in a neutral position, zero directional load. Adjust the motor to your spec. and tighten the motor strap bolts while in the chassis. I built a wrench to help facilitate the tightening, but standard will work. The recoil removed helps access the mag side. Recheck your measurements. Now you are ready to remove the socket head cap screws, lift the motor and torque the motor strap bolts. Bolt the motor back in and replace all the removed parts and you should be ready to ride.
When this sled was finished it was 11.516" center to center and .08" lead in. I like any where from 0.00"-.030" lead in.
Excellent info^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
My 2013 PRO-R 800, C/C short by 1/8", and a good amount of engine "twist"
My bud's 2012 600, C/C O.K., a good amount of engine twist , again