Have you tried adjusting the clutch cable???? A few weeks ago the clutch on my XT660X suddenly started to not disengage correctly, the "feeling" only started at half of the clutch lever movement. I struggled with this for a while and adjusting the cable at the handlebar lever made no difference, so then I tried to adjust the clutch at the engine and everything came back as it should have been. Worth a try maybe?? Ciao....

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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....