This product is a great the OEM. With the help of youtube how to videos the installation was very straight forward. I did have some question on what was needed to install the valves and the online chat room answered all my question.Installed these with the springs as well, after the initial break in, maybe 4 hours, Haven't had to adjust the valves for about 40 hours and counting.Hold up great in a highly built 4 stroke engine that takes a lot of abuse. Highly recommend.
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