Suzuki TL1000R & TL1000S Forum
i would still ride it, but then i'm a cheapo :) 4yrs isn't that long.
as long as i don't see any degrading rubber (small cracks etc..), i would ride it.
I would take her up to speed, and do more or less do a panic-stop, to test the rubber for grip, and if that's OK, i would ride it...