G&G Powersports in Muskego WI has some good mechanics and people that know their stuff. I have had a particular guy do work on my Polaris stuff in the past and he is rock solid.
3rd for John Hartwig Motorsports in Johnson Creek. Right next to I-94. 1-9pm Mon-Thur 9-5 Fri-Sat. 920-699-3180 They are no nonsense, fix it right the first time, family operation.
A+ powersports Elkhorn... I live in Illinois and buy my sleds from Kevin & Barb. Good customer support. See them Labor Day weekend at Walworth County Fair in Elkhorn, Wi