here are all relevant torques for metric thread and various materials of course in metric values of m/kg.
http://www.zabernet.de:16080/bill/pdfs/Anzugsmomente.pdfsince you are probably tightening the original "butter-soft" bolt into aluminum, don't overdo it. Go for a less than the standard, about 35m/kg.
Be careful about using Loctite on allen-head screws. Most probaby you will end up "milling" out the hex with the allen key when you try to remove them the next time, unless you heat up the part first. This is what I encounter most, with Yamahas, too.
When you do successfully remove the bolts on a Skorpion, replace them with 12.8 quality, apply grease to the threads and use a Schnorr safety washer, not a lock washer which only ruins everything to no advantage.
http://www.schnorr.de/produktprogramm/schraubensicherungen/sicherungsscheiben_s_vs_uv_en.htm