Popped off the e-clip of the secondary vacuum-powered linkage. I didn't lock out the secondary butterflies (mechanically). Nevertheless, I could pull 5200 r's before the vacuum would suck the secondary butterflies open, and then it would do the same as when the vacuum secondary valve would open at 4700 r's.
Lean? At 5300' altitude? Not sure a new carb would fix it. Any secondary jets I should buy to see if I can get the mixture right? I'm thinking it's jetting....but at least the mechanicals (valve springs/timing/chain) seem to be ruled out.
What're your thoughts?