Hell I have 12,500+miles on my 2003 with 3 synthetic oil changes each riding season and it is a prestige motor. If you care for it internally, it should last for a long time. There is many miles on others from 0-60,000-100,000. How long the motor last, depends on you and your dedication to taking care of it.
Oh yeah, I dog the SHIT out of my 636. I run it hard, but keep it clean.
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