The 'Ace' should have a copy of Operation Instruction supplied with it.
I've attached a pdf copy, but the relevant page 46 is unreadable, and the real thing is not much better.
The black bars read from top to bottom: 10W, 20W, 20W, 30W, 40W and 20W40/20W50, 15W40/15W50, 10W40, 10W30.
The Celsius temperature scale reads: -10 0 10 20 30 40oC
The equivalent Honda manual, for engine work, is the CG125. If you would like a digital copy I can post one.
Crazy