This relates to my bike build in my signature below: 1982 GS850. It's a DOHC setup and I've got an odd ticking noise that is definitely coming from the valves (used a stethoscope and the origin was obvious) This developed after a particularly hard start on possibly bad gas which was remedied that same day 0.3 miles later. It is not audible over the noise of the engine, and is really only noticeable while idling at 1k rpm, It also was intermittent at first and has a slight interval to it now still. I'm here to get some info and opinions from the lovely people here after searching the depths of google myself: 1: Do you think a flush would cure the problem? Even at the risk of taking out other deposits on a 44k engine with no history? 2: I'm using 10-40w (as manual and cap calls for) fully synthetic oil- could this have caused the issue? 3: My petcock malfunctioned (I botched a repair, it's fixed now) and was constantly on for a few days. My carbs have overflow spouts. Would there have been any effect? 4. I filled my oil incorrectly putting about 1.5 qts too much in (had it on it's stand when i'm not supposed to and ran it and topped) this caused oil to come out of the overflow line in the valve cover into the airbox (so that's what that was!) Would this have possibly caused it? 5. Am I asking the impossible of you guys to help me out on this? Here are some videos I took but 10 minutes ago: Bad operating noise: <iframe width="560" height="315" src="http://www.youtube.com/embed/I-1nMuNuQ5c" frameborder="0" allowfullscreen></iframe> Normal operating noise: <iframe width="560" height="315" src="http://www.youtube.com/embed/iqyXP-mcYvo" frameborder="0" allowfullscreen></iframe> The tapping has a sweet spot in idle rpms- It's exactly what they manual calls for too. Increasing idle rpms lessens or eliminates tapping but then it's not to spec! Am I just being paranoid?