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I picked up this Wing about a month ago, it has 55,000 miles on it. The idle was choppy and rough, but it ran great at 2500 rpm and up. I hooked up my emgo vacumn carb syncer and tried to balance the carbs.



Here's the odd part......when I'd adjust #1.............#3 would change. Same with #4 and #2........when I'd change one, it would change the others. After messing around for a long time....I got them all close.



Now, however, the engine races and does not idle back down. If I back the idle way down.......no racing problem, but now it won't idle.



Vacumn leak? Timing? Anybody got any suggestions?



I'm bummed, I've been riding it to work for a month now with no issues except the rough idle....and now it's nearly unrideable after syncing the carbs. Quite frustrating.
 

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#3 is the base carb and it should never change. You adjust #1 to match #3, adjust #2 to match #4 then match left side to the right side. Always re-adjust the idle to keep it around 1000 rpm's during the process.
 

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Maybe I wasn't clear.........I understand that #3 is the base. When I adjust #1.......the vacumn reading for #3 also changed.......dramatically in fact. The same occured from #2 to #4.
 

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When you match 1 to 3, 3 will change some- they need to balance (be the same). doesn't matter what they read, as long as they are the same. readjust the idle. make 2&4 match. don't worry about 1&3 at all. then when they are the same, match 4 to 3 (or left to right).
 

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Hi Bish,

Welcome to the forum.

Unlike most other bikes, the order in which you sync the carbs on a 'Wing is absolutely crucial. If not done right (as explained by Bag and Brain) the bike will never be right.

Of course there may be some other problem that won't allow the carbs to balance, but we need to know we've tried correctly before moving on.
 

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I had that problem a few years ago and I had to take my carbs apart and put them back together and then synch them. I had some kind of a air/vacuum leak. It drove me nuts trying to synch them for a while but after a simple dismantling and re assembly they worked great.

My guess is one of your seals... isn't sealing.
 

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grayglennsr wrote:
I had that problem a few years ago and I had to take my carbs apart and put them back together and then synch them. I had some kind of a air/vacuum leak. It drove me nuts trying to synch them for a while but after a simple dismantling and re assembly they worked great.

My guess is one of your seals... isn't sealing.
Spot on. Turned out to be an air leak. I got it now.



Eric
 

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Bish wrote:
grayglennsr wrote:
I had that problem a few years ago and I had to take my carbs apart and put them back together and then synch them. I had some kind of a air/vacuum leak. It drove me nuts trying to synch them for a while but after a simple dismantling and re assembly they worked great.

My guess is one of your seals... isn't sealing.
Spot on. Turned out to be an air leak. I got it now.



Eric
Where and which one? Nice to know for future reference.
 

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Intake boots on #3 and #1 were lose. Tightened 'em up, and all is good to go. Though I do think I still have a intermittant leak on the seal where the linkage comesout of #1. That will have to wait until I pull the carbs and rebuild 'em.
 
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