Hi Bolla, is the starter motor spinning ok. Try checking the gears behind the small cover above left engine cover. The gears might be loose on their pins, circlips loose. Or it might be the starter clutch not picking up. If its the starter clutch, you will need to pull off the CDI magnito and check the rollers in the clutch. Might just need a clean, had a KLR do the same, just pulled it apart cleaned with WD40 and it worked ok after that. Xt 600 seems similar .How was Eastern Europe trip ? Brian.
rust & dust