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1985 GL1200 A
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Are your carbs properly synchronized? The reason I ask is carb synch'ing will show vacuum leaks as inability to stabilize the vacuum level, which is what your checking/equalizing when synch'ing.

Are the large 0-rings at the bottom of the intake tubes, where they connect to the heads, new/fresh and tight? That's the first place I look for vacuum leaks. Easy test is with motor warmed up spray some Gumout or similar around the joints, one cylinder at a time, with the engine revved to 2,000-2,500 rpm and if it revs up at any time, that's where there is a leak.
 
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