Watching one on eBay 
vin listed as 393209219, which doesn’t seem to fit a category in VIN table on tech library 
seller not taking messages which is odd, but he’s local and I will pay cash F2F so I can accept this twist 
any idea if this is a valid VIN or perhaps sellers dyslexic and it should be 393219209?

Sorry not an answer but if you buy it and need a carb I have one for sale

Starting VIN for 1975 was 393-200101according to Yamaha spec sheet

thanks Mark
I got the following from VIN table in Tech Library, was i looking at the incorrect line?
Do you know if these come with lights, street legal?
The one I am looking at doesn't have, but does appear to have turn signal switch by L hand grip and a hole in rear fender, perhaps for a tail light cable.

1975 GT80B Competition Yellow 393-210101 to 214420

ps. just noticed that spell check is now working on!

"Do you know if these come with lights, street legal?"

Yes they do. I attached a photo of mine which is the same bike. 
 

No comment on the VIN table. Enduronut is normally very accurate.

Or the data I have in an old binder could be wrong. At least you know the VIN the seller posted could be correct.

thank you Mark and Schu

1978 FT 80. What should Carb float height be set at??

still have the carb for sale??

I still have a gt80 carb for sale