hi guys, im currently rebuilding my engine but the crankcase/crankshaft bolts stopped me because i don't know how much torque should i tighten it. can't seem to find it online and in the manual.

you can download the NC27 manual here https://www.litetek.co/Carb_Kit_Honda_CB1_NC27.html.
The engine is the same as the NC23 from the cylinder head down so the torque values quoted here will also apply to the NC23