The 660 motor is bulletproof. Today on my way to the office I was sure that I had hit fifth gear but at about 125kph the engine seemed to be hesitating, then I realized that I was in 4th and it was bouncing happily off the rev limiter (the X has no rev counter) so I slid into 5th laughing. Great fun!!!!

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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....