KTM RC 125 - 5.3 Engine Number; 5.4 Key Number

5 SERIAL NUMBERS 21
5.3 Engine number
402486-10
The engine number

is stamped on the left side of the engine under the engine sprocket.
5.4 Key number
402245-10
The key number

can be found on the KEYCODECARD.
Info
You need the key number to order a spare key. Keep the KEYCODECARD in a safe
place.