carb sync, again !

[Chromedome]

got to ask guys or wont get it done tonight and I want to get it right,sorry, 82 GS1100L stock, when synch,ing the carbs 2 and 3 I know should be different from 1 and 4, is that more vacuum or less ? and by how much ? iv got the dial gauges the cheap less popular ones, many thanks, Stephen.

[mhobryan]

See what Steve posted in my thread. I would think your gauges would be calibrated in inches or cm in mercury equivalents...you may have to convert from inches to cm.

When you had the carbs off for cleaning, did you do a bench sync? That would have gotten them close enough to get it running for the vacuum sync.

If #3 has higher vacuum, it is virtually CLOSED, the engine is running on the other three carbs. Turn the adjuster between #3 and #2 to close them down a bit to match #3. The manual calls for matching #2 to #3 first, then setting #1 "half a ball" higher. Finally, set #4 to match #1.

Through experimentation with a factory gauge, I have found that "half a ball" is 2cm of Mercury. That would be TWO of the marks on the sides of your gauge. (Yes, I have one of them, too.)

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[Steve]

..., when synch,ing the carbs 2 and 3 I know should be different from 1 and 4, is that more vacuum or less ?

According to the manuals, 2&3 should have just a little LESS vacuum than 1&4.

According to many of us who have been doing this for many years, it doesn't really matter.

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