I got my cylinder and head back from ftz racing for my yamaha 175 tri moto. They did an mx port job, bored the cylinder, and shaved and polished the head. The exhaust port is polished mirror smooth. You cant see it well in the pictures. Looks Like great work But, will let you know once it is running. That is the true test. Also had them put a new rod on the crankshaft. Glenn Oister