Thanks guys!
Whatever I'll end up with, there is another question i have. If I plan to travel through Africa for about 4 to 5 months, how much luggage space should i have? An idea of total volume in liter perhaps? I plan to camp, so I will be taking a tent, sleeping bag, sleeping mat and some camping equipment. Also some spare parts, clothes, ... all the usual things. Not planning to take hitech stuff like laptops.

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What ever you take much of it you will never need. But you will use all the room you have. Just the way it is.

Some thin many people over look is a tarp and rope cheap small and many uses.

The parts you take will depend on the bike. Last year I wish I had rear brake pads so I will take them next trip. My bike dose not have problems with spark plugs so I skip them I take chain wax but not a spare chain. I go have a few master links and a little bit chain (or I did gave that to some who had more need than me) I have plugs and patches for the tiers.

For a tent I use a 2 man tent now, I have used a 1 man tent but like the room of a 2 man, on long trips in the rain the space is nice. I use a air filled sleeping mat that now has a whole in it I need to fix that. A sleeping bag that is rated for lower temps than I will ride in for long.
Clothes I have 2 sets 1 for riding the other to wash 3 sets of undergarments and 3 pair of socks 1 pair water proof sock, I hate wet feet. All some sort of synthetic, drys fast and packs small. HU sells them go to meeting and buy one there and know all that need and get some good riding kit. It will save you more than spend on it. A liner for the riding jacket and riding pants with liner. 2 sets of gloves one is for cooler days.
Tool kit? Well all that you know how to use. Try taking apart the bike and find out what you need. You will need to remove the tier from the rim and the rim from the bike. My kit did not have all the stuff I need to do that it now dose. Replace the air filter, pull the gas take, replace spark plugs, do a oil and filter change clean and replace gas filters. All of this will need to be done before you go best if you can do if need be. Some things you will want is duct tape, zip ties, a good bit of wire some epoxy filler (comes in a tube and you kneed it together) there are lots of them some like JB weld I have both. Spare bolts and nuts tier pump and patch kit.

If you need Ideas there is some places to look at all the junk you may want to drag around with you.
Gear, Parts & Accessories for Adventure Motorcycle Touring - Touratech-USA
Over 5000 Items In Stock and Ready for Immediate Shipment - Whitehorse Gear
Aerostich/RiderWearHouse Motorcycle Jackets, Suits, Clothing, & Gear :: Aerostich/RiderWearHouse Motorcycle Jackets, Suits, Clothing, & Gear
Camping Gear & Outdoor Gear - Outerwear & Outdoor Clothing from Campmor.com
http://www.rei.com/?s_kwcid=TC|13030|REI||S|e|6846201373&cm_mmc=ps_go ogle_reibrand-_-REI_Brand-_-REI-_-rei&gclid=CJTV-ISkoqcCFUpJ2godtHYtCg
and many more.

Odd things I take
A book on how to fix my bike.
Tripod and camera looking to get laptop.
A bit of food a few days of water never know when you need to stop or just want to.
Some thing to read.
Electrical tester.
Some time I will get a chair to sit in.

Now just dont ask what stove to get people here get funny about it. Any thing that works for you will do.

I use up all my boxes and there 33 and 45L. and a around 30L. in the top box. When I had a smaller soft bags on my bike it was half that I use the area I have.