^^^this. The valves are not hard to do, and definitely follow the ninja250 wiki. I only had to remove the coil on the right side of the bike because the cam chain took out too much room for me to work on the valves on that side. It says that opening up the valve clearances will increase noise, but in the case of the '04 bike I just got, it made a very noticeable DECREASE in noise. Also, most bike mechanics I have heard of will charge you a lot (read: too much) to adjust them.
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