WARNING! That manual cover says agility 125 but it mixes the agility 50 and 125 specs. I would look through it careful. Also that is the manual that gave me the wrong info.
0.04MM is only 0.00157 inches which is way small. As per the last post 0.12mm to 0.004 inches is about right.
I wish kymco had a team read over the service manuals before printing. Decimal places and also metric vs standard can destroy an engine.