I thought this might have been issue but wasn’t for sure.
You’re clutch cable is too tight, and you are slipping your clutch. Must be an 1/8 of looseness otherwise you are slipping your clutch because the plates are not fully seated. I hope this helps.
I did turn back on the screw assembly. After that during the first ride adjust the lever side too.
Thanks for the tip.
Nice someone take care of this old bikes, they are bullitproof really 😅
Indeed, they are still running great, and have a lot of fun with them. :)