Do not worry about the stripped JIS carb screws, they are soft as butter so this is common, besides you will be replacing them with new stainless steel Allen head cap screws from your $24 RPM kit:
http://rpmracingca.com/proddetail.asp?prod=carbkitYes, plan on removing your carbs for a complete disassembly, cleaning and replacement of the O rings (included with the RPM kit) instructions to follow are in the Carb Files.
When you have your pilot jets and needle jets out (aka: emulsion tubes, jet nozzles) they are brass so look for deep corrosion and replace if needed.
Do you have ethanol in your fuel in Norway? We have 10-15% over here in the states. If you do, *never* store your bike with fuel containing ethanol.
https://samscycle.net/storage-warning-local-gasAlso, plan on an inspection and cleaning of your fuel tank. Hopefully rust is not an issue, but with ethanol in your fuel, rust may need to be addressed.
Don’t be discouraged, since the addition of ethanol in our fuel, we have become proficient at carb cleaning.
Think of it as a right of passage….like starting your FJ with the clutch slave not installed, kinda like that…
Your bike ran right at one time, it will again. We will help you….please ask questions. Cheers…Pat