Cg13 ignition timing

Allo there
So was doing the timing on a 96 cg10 and set that to the book of 15deg
So tried mine and it hovering around 10deg , even the dizzy was set way back
So 20 atm (I know ) But does a cg13 run at 10 or 15 deg?
20 deg ,poor starting and but flat on the mid with only 3rd showing an implement , so going to try 15 otherwise back to how it was lol