Fits 2013 - current ski-doo Summit XM 146, 154, 163 and sounds like it will fit the 2017 Summit 850 Rev Gen 4, Tom's snowmobile E-motion kit. Has about 750 miles on it. Works great, never had an issue. This set up really helps control ski lift, very easy to adjust to the individual rider. I have been able to let my limiter out 1 hole, with out adding ski lift, that's how good it works. Whether a you have a Big Bore, Turbo or stock this kit really does make faster smoother!
