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The cam chain tensioner is self-adjusting as far as I know. It isn't a very complicated part anyway. These motors are noisy to start with. If the oil is filled to the right level, you will still hear a light tapping noise that comes and goes. That is fuel injectors. It sounds like valves, but it is the injectors. If you don't like the way it sounds, run injector cleaner through the bike for a while. That might quiet it back down. It isn't something to worry about. If you have a louder, harder tapping, it could be all kinds of things, but I doubt that it is anything other than the injectors.
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