Yamaha motor serial number 3YMXX.124GCA

SOURCE: firing order for yamaha xj650 1981 motor cycle

without a manual can you set-up the timing mark on flywheel
an see what cyl is compression stroke to find #1 cly

coil 1 are spark wires 1 and 4 cyl

coil 2 are spark wires 2 and 3 cyl

now if still have trouble then (if same plug connection) switch the around inlet plug on coils form bike wire harness or swap spark wires

SOURCE: Yamaha YFZ 450 engine serial number

im unsure but arent they on the sterering stem on a metal stamp or perhaps under the gear shifter I am unsure

SOURCE: decode pre 1980 motorcycle (yamaha) vin #

Call a Yamaha dealer. If they can't de-code the antique VIN then Google " Yamaha Motor Corporation USA " > and find a number for customer relations. Make enough calls and someone is bound to be able to help.

Look at me, I'm helping!
Please rate this answer. Thanks tlparkerjr!

SOURCE: 2001 YZ426 VIN LOCATION

This is where it should be:
http://www.cyclepedia.com/wp-content/uploads/2008/08/yz450f_776.jpg

SOURCE: i purchased a imported yamaha yz450f need to find

VIN numbers are usually 17 digits long so it appears you are missing some numbers/letters. If you find the full 17 numbers, enter them into this website and it should tell you all you want to know.

http://www.motoverse.com/tools/vin/yamaha.asp

Good luck