In the old days, sleds seemed high maintenance. Different story in the past 30 years. My last sleds I owned about 6 years, rode each of them 3 years without even changing a spark plug or drive belt. Then we changed plugs "just for a PM". They were both used when we bought them. Maybe in the 6 years we "had" to replace a couple of idler wheels, but they won't leave you sitting. Had equal experiences with the sleds prior as well. I never really ever thought about break downs with the last several sleds I owned.
