in my area a 1,000 miles a yr is pushing things
BUT on motor life,
I seldom see anyone here going past 4k before doing work
NOT that they cannot be going farther, MOST guys start to want more HP and start building motors, as odds are many bought the sleds for a deal, and want to mod them
and I fully agree, HOW the miles are put on matters more than how many
BUT at some point LOTS of miles just turns onto wear of parts
so anything past say 3500, I would start doing compression tests, for a base line and, when it gets to a certain point, time for a new top end or???