a CR80 is a two stroke so you normally don't put oil in the crarckcase. However honda, yamaha, bel-rey, and a bunch of other companies make special transmission oils for them
About 0.63 quarts or 600 ml of gear oil. I would use SAE 80 W gear oil.
I have a cr80 and i run 32:1 through it and it runs like a champ.
32:1
600ml any 80cc takes
1 quart of JASO MA, MA2 or SF/SG rated motorcycle oil.
The Honda CR80 goes about 60 to 65.
yes the monts line up
depends you can use 33 to 1 but i would use 32-1
i run 10w 30 in mine, maybe a little thicker or thinner would be good also
No you can't used 10W-40 in the Trans either the transmission oil or you could go with Mobile 1 synthetic
cr80 is faster because it is lighter and the rm80 has more power but the cr80 is lighter and its still pretty powerfull so if your looking for a motorbike look for the cr80 more then the rm80