KTM 450 EXC-R EU - Manual (Page 10)

LOCATION OF SERIAL NUMBERS
8
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Chassis number
500127-10
The chassis number b  is stamped on the steering head on the right.

Type label
500128-10
The type label b  is fixed to the front of the steering head.

Key number (EXC-R bEU, EXC-RbAUS/UK, EXC-RbUSA)
500125-10
The key number b  is stamped on the key strap.

Engine number
500072-10
The engine number b  is stamped on the left side of the engine under the engine
sprocket.

Fork part number
500082-10
The fork part number b  is stamped on the inner side of the fork stub.