Kawasaki Motor VIN question

i have a few old motors laying around in my garage and im not sure what year/size they might be. is there any way to tell from the motor VIN? i think 2 are 650's and the other is a 750 but im not sure. any imput would be greatly apreciated.
 

Mouthfulloflake

ISJWTA member #2
Location
NW Arkansas
the 750s that I have seen have "743" or something similar to that cast into the cylinder I think.


743 CCs I assume.

I think the 750 crankcases have one more bolt holding the reedacages/intakes in.

green is later ( 1995/1996 or newer) larger wrist pin bearings

grey is older 1995/96 older, small wrist pin bearings.

post pics if you can.
 
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