Received the kit and have already installed it. Definitely not the best finished kit on the market , and we’ll see how it does long-term. Was using this as a test for learning to port, so maybe I made some errors, but the cylinder plating seemed extremely thin around the exhaust and intake ports. Not sure what thickness they’re going for with the plating, but it only seemed like 0.001 or so. The skirts had some weird grinding on the edges, and some obvious grinding marks on the outside of the cylinder. Really wish they would include a needle bearing for the crank/piston link. Transfer ports had obvious casting imperfections.
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Cylinder kit
March 28, 2021
Reviewer:
Dave from Windsor Missouri
Thus was my first time ordering from this company. I received the kit much sooner than anticipated. Gasket's where all correct but the cylinder was the wrong one. Customer service was very helpful in making sure I got the right part and in record time I might ad :) all in all quality parts and excellent customer service I would definitely order from this company again
Hyway 390xp rebuild kit - keep an eye on it... 
Cylinder kit