Merc Cowling off, Idle high...
Hey guys, I was out doing a de-carb on my motor yesterday and noticed something strange. I was idling at 750, when I opened the clamshell covers on my 86 blackmax 150, the idle slowly crepped up to about 1100. What the hell is that about? I closed it up and back to 750 it went. I checked for anything that may be hitting the cables or the linkage, nothing. I tried it a few more times about 20 mins apart with the same result. It seems like whe I open the cover it lets the carbs breath better. Should I install vents and adjust my idle speed accordingly or is something wrong here?
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