These parts are from Yamaha 1973 GT80/GT1 Mini Enduro 80 that was in dry storage for several years. The bike is pretty complete and will be parted over next few weeks.

This is the Cylinder and head with piston not showing signs of seizures and still has snug fit. Looks like standard bore and may need bored for best performance. Let the pictures do the rest of the description. Do  your homework for other fitments. 

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