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.
20/50 or 20/30
Any JASO-MA or MA2 approved oil, weight 15-40 W.
1 quart of JASO MA, MA2 or SF/SG rated motorcycle oil.
660 cm2
About 650 ml.
depends you can use 33 to 1 but i would use 32-1
The 1986 Honda Rebel has no external oil filter. There is an oil filtering screen just below the oil pump in the engine crankcase.
i run 10w 30 in mine, maybe a little thicker or thinner would be good also
0.9 quarts or one liter.
Under the crankcase, centrally and a bit to the left side.
4 quarts with filter change