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Usually the serial number is on a tag mounted on the bracket that holds the outboard engine to the boat.
It is a 2003 4-stroke outboard
2stroke 4 hp yamaha 6eq date of manufacture
I HAVE A OUTBOARD C150ztXRU
According to the Yamaha guide, the outbound serial number is located on the label in the clamp bracket. The serial number is helpful when replacing your motor.
235386
216793
1979/1980
1981
it is a 1983-
2005
40tlru is the model number for a 1996 2-stroke, oil-injected, 40hp Yamaha outboard boat motor, not a serial number and not for a motorcycle.