447 engine idenification

[hank2]

i'm rebuilding a '79 xs650sf. How can i tell if I have a 447 engine so I can fit Mikes XS 5th gear overdrive? Everything leads me to believe I do. Also, anyone have a nice 3rd pinion gear yamaha part #256-17131-04-00? My cogs are worn.

 

[Scrambled]

79 is supposed to be a 477 . There is a guide in the tech section so you can cross reference your serial # .

 

[hank2]

Thanks Scrambled. Did you mean 447 as I know one digit can make a difference. I searched the tech section and could find no reference to the 447 prefix except '74-'77 and know thats not me. All descriptions in Mikes lead me to believe this gear will fit. Just want to make sure as it cannot be returned. CHEERS!

 

[Scrambled]

yup, my bad 447 it is .