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I have an '07 and around 9,000 miles it started doing the same thing. If I stop for a while (meal stop) when taking off I run it up to 3,000 RPM then let off to shift and I hear a rattling chain sound (very loud). After about a minute of riding all is fine. When cold it will do this for about 5 minutes of riding. I too use Amsoil. Of course, by the time I get to the dealer (an hour) it won't do it unless it sits for about 30 minutes and of course they don't have the time to wait for that. I have noticed no change in the way way it runs - it has always run great. I'm thinking perhaps the new hydraulic cam chain tensioners are sticking until it gets hot?
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