My top end has had a ticking/metal on metal noise since I purchased it. I had adjusted the valves hoping to quiet it down, and it did some what. The right side seems to be where the noise is coming from, still. I have adjusted all the valves to spec.. so I think anyway. The noise really quiets down when I engage the decompression valve slightly. Does this indicate that my right exhaust valve is too tight or too loose or what? Any ideas. I have also read that the cam chain tensioner can cause a similar noise.. so that may be part of it as well. Any one here care to run some ideas or explanations by me? Thanks.