Yeah rust comes from damp, so even if the bike is not used if it has been kept in a damp store (garage or whatever) then rust is inevitable. You need to run over the whole bike and before you get round to sorting all of the points mentioned by our mate above you also need to cover the bike with WD40 or similar to combat the corrosion. PLENTY of oil and grease required!!!

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(Now sold on, sob) 2011 Blue XT660X with gold wheels, was 26,500 km.
Engine mods: K&N Stage 1 filter, DNA Stage 2 filter, snorkel removed, Kev fuel mod fitted.
Plus: smoked Puig screen, Yam aluminium sump guard, Yamaha / Acerbis handguards, Givi Trekker aluminium side cases, Leo Vince X3 cans plus Kev front fork mod and Fender Xtender. Just fitted Michelin Road Pilot 3 tyres.

SOLD the XTX for a Super Ten 1200. And just bought a Raptor 700 so staying on here for some tips....