So except chain, tubes, theottle cable, which spare parts do you recommend me to take with me to my journey?
Most of my touring experience is with plain pedal bikes, so I'll speak to that and let others advise you on spare parts for your motor.
On every ride I always carry:
patch kit
spare tube
tire irons
pump
gloves and a rag (why get messy?)
hex keys/allen wrenches
chain tool and a few extra links (not a whole chain)
very basic first aid kit of bandaids, antibiotic ointment, gauze, tape and tylenol.
Lastly, I'm
so much safer with my blinking tail-light and I carry a headlight in case I get caught out at night.
When touring over a thousand miles I do the following:
I start out with a reliable, tuned-up bike. Both brakes are tight enough to lock the wheels. The wheels are true, the spokes are strong and tight, and the tires have lots of tread. I put on a new chain and cassette. The shifting is crisp and reliable. Everything is dialed in and lubed. If you can't do these things yourself take it to a shop.
I also carry:
lube for my chain
needle-nose pliers
6-in-1 screwdriver
adjustable wrench
miscellaneous hardware and specific bolts to match whatever's holding my racks to the frame, so if a bolt shears off I can easily replace it.
To improvise repairs, I carry bungees, zip-ties and duct tape or electrical tape.
Finally, be capable of basic repairs. At a minimum you should have actually
done the following tasks:
Pull your front and back wheels off the bike and reinstall them.
Successfully fix a flat (be able to apply a patch and install a tube).
Break and rejoin a chain (and loosen the stiff link that usually occurs when joining a chain that doesn't use a master link).
Practice until you have the skill and confidence to do it when you need to. Believe me -- sitting on the side of the road with the sun setting and traffic zooming past you, 519 miles from home and miles from your destination, is
not the time to figure out how to use your chain tool! Oy vey!