help identify this motor

I just got pictures of it. Guy was describing as a free air, but its a fanner with the shrouds off. Single carb, Single exhaust, Kidney clutched piston port. So I would have to believe this is just another plain y433 motor. When he told me a free air 433 yamaha for only $25, I should have known I would be disapointed!
thanks for the help
 
Thanks, It was a real fun project. Didn't get much racing in though. Broke something every weekend!!!!!!
Last race I had a magnet explode in the flywheel at nearly 10,000 RPM!!!! Tore things up pretty bad
Search my user name to see more pics of my little gem. I have several posts showing it off
 
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