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You might just be hearing the valve lifters, these engines (I'm quite positive) have solid, adjustable (non-hydraulic) valve lifters that always have a little tapping noise especially at low RPMs. They tap a little because you have to maintain a slight clearance between the lifters and the valves in order for the valves to close completely.
As long as you're not hearing piston slap or a knock from the bottom end you should be OK.
 

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Thank you for the comment. The noise is definitely on the top, not the bottom. This is reassuring!
Just make sure to also check that air filter mounting bracket in case it's loose or broken, it's a common issue.
If the clatter you hear is from the top end, I wouldn't worry about it unless it was obscenely loud.
 
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