250-500cc interior engine bolt torque

so I'm in the middle of getting ready to reassemble my engine case and this is the first time I have ever done something like this(rebuilt the entire bottom end) and Im trying to figure out how am I suppose to know what these bolts are called and their torque setting.
It says y m c 10.9 is the 10.9 the torque?
thanks!

10.9 will be the bolt grade

You can check this site for what the grades mean.

https://www.boltdepot.com/fastener-information/materials-and-grades/bolt-grade-chart.aspx

I always find it difficult to sort through the list of torque specs in the manual, but if you can't find exactly what you are looking for, they also have a general torque specs listed for standard sizes.

And someone will certainly chime in saying, "Tight is tight." I also prefer a torque spec when it is possible.

That's about all the help I am at the moment. At least it takes care of one of your questions!

alright thanks can't seem to find any info in the manual so difficult to look at with 5 different languages in the same paragraph haha most likely blue loc tight and tighten it

yup. that screw head pocket wont take a lot of torque in some cases that type of socket (hex/torx/phillps et, al.) will blow out before the shank can stretch appreciably. if there's no spec on the call out sheet i usually just clean the hole and screw shank well- brak-kleen/cotton swab/air gun to get it spotless then add a small drop of blue loctite and snug her down. to remove it if ever nec heat the head with a pencil torch to soften the locking agent before trying to remove.

yep i learned on one of the bolts, bearly torqued it and stripped. had to use the trusty wedge tool and hammer almost couldn't get it
thanks guys!