Price seems ok if the bike is in good nick and the mileage is genuine. To be honest you can find all of the answers you need on here, but before you start you need to know what your bike has ie is it standard or has the owner already made some mods. Then from there things are fairly simple and you can go step by step depending on how much dosh you wanna spend on it and how talented you are with the spanners, but the air filter and exhaust mods are really dead easy, even I managed!!!!

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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....