Motorcycle Questions? Ask a Mechanic.
Hi and thank you for your question.
The first thing I need to know to be able to help you is whether this is a USA model or is it from another world wide market? The manufacturer supplies information for the models they import into their country. I am in the US so if it is a US model, I can try to help you. If its not a US model, please state the country of origin so another expert from that region can assist.
I am going to have to check to see if I have access to any information that would help you determine the year. Exactly what are you trying to find, parts wise that you are concerned might be different?
Thank you for the additional information.
I would be shocked if any of the body work were still available for the 81~84 model years. This may end up being a moot point. I will look it up tomorrow and get you an explanation of what all the letters mean and we can go from there. The engines should be the same, with the only differences being if they superceeded part numbers to newer parts. Compatibility in the engine should not be a problem. This was not one of their flagship models so they were never on the cutting edge of technology and changing from year to year. The 450 engine is essentially a 3rd generation GS400 engine. They did obviously increase the displacement, but that is just about it.
Exactly what are your engine numbers anyhow?