KentuckyKen,
The 12 horse motor in the 129 is on its last rebuild (.030) but runs well. Also fitted it with a hydraulic lift that came off a parts 1650. The lift came in handy, as the snow blower saw nearly daily use for nearly a month trying to cope with the triple blizzards we had in December and twice in February. K321 and K341 cub spec Kohlers are hard to come by around here, the pullers tend to snap them up. Might just hot rod my spare K301 block a little with relief work, hotter cam, and some porting/polishing, etc. if something bad happens to the current power plant.