say i'm ridingand roll on the throtte hard at about 4-5000 rpms the engine makes some kind of faint clattering noise. it only makes this noiseuntil therpms go up to about 6500.it sounds valvetrain related. i run 89 grade fuel, run 1 1/4" of chain slack and keep it well lubed. the bike idles and runs perfect otherwise. anythoughts? might just be normal noise. btw, the bike only has 1400 miles on it. thanks