Well, after a weekend of test riding, jumping and about 1000 wheelies I have to say. The Axys RMK shortened to a 146 is a LOT of fun. This build was only to run for a few late season rides and see how I liked it. Definately putting the parts back on the shelf once the snow is gone and will be converting my 850 khaos to 146 by late march next year.
The build:
2018 Axys Pro 155
Pro QD pullies for geardown
TRS Clutching
Straightline Performance pipe/can
Elka stage 5 shocks all around
To shorten the sled I used:
IceAge performance bomber 146" rails w/ 8in wheels
Composit M66 146 2.6" track.
I had already chopped 5in off my tunnel this winter running a 156 3inch so the tail end was already plenty short. the 146 looks pretty perfect under it. If i were going to stay fulltime 146" I would have cut more off but the 5" cut is a good balance for running both.
This sled is stupid fun. The pipe/gearing/clutching combo comes out of the hole FAST. I can actually bunny hop the sled with a quick gas brake combo move. Its not a TON faster as its still a fairly tall lug track and 2 ply so similar weight as my 3in. BUT how it transfers weight is incredible. It is so cool to rally around on and 'jib' off just about anything. I ride it a lot more like how I would ride a dirtbike and a lot less like a snowmobile. It still climbs fairly well but definately will flip over quick if the snow is soft and allows you to trench in. Hopefully I'll have some photos and videos from this weekends adeventures to share.
For those wanting a 146 but dont want to go to the wide boards/laydown steeering/big seat etc of the Switchback assault model I can assure you building it off the RMK will make you a VERY happy camper.