Castol TTS Oil Mixed at 40:1
There is no rm 125 fourstroke they make a drz.
If you are talking a RM 125 then I would use Redline shockproof gear oil ......IT IS AMAZING.
10w-40 and the oil to gas ratio is 32:1 or 20:1
120mm from the top
no all 77 and 78 are air cooled
31:1
32 TO 1
36:1
it is 50 to one with mc 1 oil
700cc / .73qt
A RM is a 2stroke and needs a specific gear/manual transmission oil and should be close to 70weight. 10/40 will smoke your clutch and gears as it will break down too quick.
These (link below) are for a 08 RM 125.