850 and 550 are different motors. His idle and engagement RPM will be different then our 850s. 850s can handle a lower engagement RPM due to our torque; the 550s need to be higher.Hey I can answer this first hand. I got the 850 touring. It worked great I thought.
My buddies kept telling me I needed a clutch kit. I contacted Ridinagain and just finished installing my clutch kit.
I was worried about it engaging at 1800 rpms. Wow, is it smooth engaging. The pulling at mid range has certainly improved as well.
The clutch kit costs pennies compared to what it will do for your machine.