Hey Gotan,
I cant help with what KLR parts are available in Europe ... but
how many kms has your bike done anyway, im suggesting all this below on the basis that its a reasonably new 2014 bike
With my experiences with KLRs in the americas, I owned a 2003 and 2013, I had a very good experience mechanically with them and rightfully blow smoke up their bum, it just seemed to be the consumable parts that wore out as due to normal wear as most other bikes do, providing you maintain it reasonably well
if parts are going to be an issue in europe, KLR parts are readily available in the americas, so why not stock up before you go. i would definitely take, especially as there will be more wear and tear on the bike from 2 up, depending on how many kms you intend on doing, and im guessing a lot...
2 x front sprockets
1 x rear sprocket
spare accelerator cable - cable tied next to the existing one
spare clutch cable - cable tied next to the existing one
4 x cotter pins
2 x front brake pads
2 x rear brake pads
1 x master link for the chain
4 x brake pin bolts
2 x oil filters
spare front and rear tubes
spare tyre patch kit
other miscellaneous for fixing stuff - you can get anywhere, but not bad to get so you dont have to hunt for it in europe
roll of good cloth ductape
assorted cable ties
say 2 meters of thin metal wire , wrapped up around your luggage rack
I had no issues with any main frame bolt snapping, just a few came loose, and at times i carried probably equal weight to what you will. I just kept tightening them periodically or loktited them in
If you are carring a super lot of weight you may want to consider a harder spring rather than the stock
It would be great to know if you can get a matching chain in europe, say 15,000 kms into your trip, as i think its just too heavy to carry if you dont need too
Aluminum handguards, I noticed you hadn't installed, will save your brake and clutch levers in a crash , or else you should probably take those as spares. you can also then bolt-screw your stock windguards which come with the bike, over these aluminium hand guards to give your hands some more wind protection in the extreme cold
maybe also ....., I would also consider taking 4 valve shims , a little too large so they can be ground down and some spare front and rear brake pin bolts, as i found it hard to find other bike makes that would interchange , and these bolts are easily stripped and a super wierd size.
magnetic drain plug isnt a bad idea, but a a few metal shards arent a bad thing as ive been told by numerous kawi mechanics, so dont freak out if you see some in your oil changes
fibre oil filters seemed to work fine for me, no experience on the metal ones
tyres, I'm sure you can find on the road with some research and calculate where you may have to get them with others help, I'd suggest putting on some decent tyres before you leave ie hiedenau, so you can get a hell of a lot further than the cheaper brands
I'd also consider having a sufficient tool kit which would allow you to access most nuts and bolts on the bike, do a quick try around the bike-pull it apart and see what your tools will be able to access and tighten , i had to get wierd stuff like a super small spanner to tighten the radiator hoses which funnily loosened a lot, that i had had no other tool to tighten. At least 2 spare tyre irons and a quality bike pump to fix your tyres
theres a write up about maybe what to expect mechanically at
http://www.horizonsunlimited.com/hub...e-2012-a-66862
good idea working at the mechanics before you go, you'll thank yourself later
feel free to send me private messages as needed

cheers
Dom