I bought two stroke kept 900 ace. Polaris chassis is made for a light weight motor. Four stroke version don't handle anything like 2 strokes do. 650 is a good choice. 

The difference is that I haven't scratched my itch, and likely won't. It's not the motor, although both available Polaris engines are good; it is the Matryx chassis that really interests me. If the Poo had even a slightly more entertaining 4S motor, I would own one.

From 4 stroke back to a 2. I thought I was only crazy one 

Yup!!! I don't need or want a different machine, but if I did I would want a new or used, '22 or newer 650 Polaris XC or VR1.  I keep spotting great deals on both used and non-current new sleds both 129 and 137.  It's driving me crazy.

Making a deal on a 2024 leftover 650 sp for the kid. 11800. Leftover prices higher this year, paid 12500 for the 850 xc last year.