Yes, oil should be put in the crankcase on a 1989 Suzuki RM 250. The proper oil to use for this is a product made by Standard Oil called 80-90W Gear Oil.
1cm3=1ml, so 770ml.
60ml
125ml
550mm
1.75l
700cc / .73qt
1 gallon gas 4 ounces oil
1 quart
mom
you put 1400cc of gear oil into the gear box do no trust the fill level screw as the amount of oil was changed under production and you would not have enough oil in it then hope nthis helps you good luck
the only place you put gear oil is in the rear end. Look on the differential and on the back there is a large nut, remove it to put in the CORRECT gear oil.