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I'm still trying to get a little bit of miss out of my 1984 1200. I get a little of the thumping like when the carbs need to synchronized. I have sync-ed them with my home made gadget of oil in a bottle and it is a lot better than it was. This happens with a very slow roll on of the throttle between 1000-1500 rpms. With a fast blip of the throttle it sounds fine and runs good out on the road but a little slow for the rpms to fall off. Seems like it lose's some of the settings over night. I also checked the sync with two vacuum gauges and they are real close, 1 inch or less. My other question is why is the vacuum reading so low? Around 6 inches. All carbs are in sync with #4 carb. Could this be a problem? Before the sync 1-2-3 carbs were about 12-14 inches. Trying to avoid a trip to the doctor for a tear down.

oldmanonavtx
 

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The symptoms you describe do indicate out of synch carbs. You could have one or more throttle shafts sticking causing them to not return to the same position every time.
 

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Could you comment on why the vacuum reading is so low on number 4 since the other three are tuned to it.

oldmanonavtx
 

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So no one has a clue why the vacuum is so low on a 1984 1200 on the #4 cylinder. Reads around six inches.

Thanks anyway.

oldmanonavtx
 

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The vacuum readings vary with throttle opening. If the butterfly is completely closed the vacuum will be higher than if it is slightly open. If you adjusted the base idle while doing the synch it would explain why the reading is different than before the adjustment.
 
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