Hi mate,

Welcome to the forum.

The bike is bulltproof, you should not worry. The mileage you state means that the bike is as good as new. As far as I know you cannot manipulate the the clock unless you dissasemble the dash. Basically by looking at the bike you can tell if the stated is true. Mine was 10K when i got it (with history however) and the downpipes were just starting to get dark blue all other things looked as new, another telltale is the seat - the colour tends to fade away with time and miles.
Technically I cannot think of something which might surprise you, maybe fork oil rings
The famous surging is to be expected but as you are in the right place - this forum, you should not worry. Couple of little adjustments and you are done.
The bike is fantastic and VERY reliable, fun to ride both city commute and weekend dash in the country.
Go ahead.

Good luck

__________________
that is how i feel about my XTR
Mods so far:
Hyperpro front springs; Hyperpro rear shock spring; modified air box; LED tail light; LED indicators + new relay; YZ pegs; Lucas aluminum bar; brisk spark plug; snorkel removed; DNA stage 1; second hand DynoJet O2 mod; crash bars; front and rear steel braided brake lines; soft EBC brake pads; mitas 07 tyres, 2in1 Metal Mule exhaust, Blocked AIS, tall OEM screen, OTR bash plate