Vacuum leak? - Steve Saunders Goldwing Forums

 
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post #1 of 8 (permalink) Old 07-15-2019, 03:12 PM Thread Starter
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Tinkering with the bike today and checked the sync and it didn't look right, gauge to the right is the number 1 carb. Tired adjusting it but it didn't seem to improve (see attached photo)
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post #2 of 8 (permalink) Old 07-15-2019, 03:45 PM
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Which carb is base on the 1000s?

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post #3 of 8 (permalink) Old 07-15-2019, 04:40 PM Thread Starter
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Originally Posted by Bike...and Dennis View Post
Which carb is base on the 1000s?
#3 is the base carb, the low reading is for #1
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post #4 of 8 (permalink) Old 07-15-2019, 05:17 PM
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Turn the adjuster out, CCW to raise the vacuum. If it doesn't come up make sure the o-ring on the intake to the head is good, check the valve clearances and if good there check the compression.

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post #5 of 8 (permalink) Old 07-15-2019, 06:03 PM Thread Starter
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Originally Posted by DaveO430 View Post
Turn the adjuster out, CCW to raise the vacuum. If it doesn't come up make sure the o-ring on the intake to the head is good, check the valve clearances and if good there check the compression.
Got them synced but it brakes up around 5k (well hit or miss with that) and is the vaccum supposed to be that low?
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post #6 of 8 (permalink) Old 07-15-2019, 07:43 PM
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They don't pull a lot of vacuum, being equal is what matters. Synch has nothing to do with how it runs at 5k. Probably an ignition problem.

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post #7 of 8 (permalink) Old 07-15-2019, 07:47 PM
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A carb sync on a poor running engine that has a weak cylinder(s) gets you nowhere fast. The amount of vacuum that can be pulled is directly related to how that cylinder is performing with compression, ignition and fuel mixture.

Find which cylinder(s) are not contributing by doing a power balance test pulling individual plug wires noting RPM drop. Then test whether rich or lean and for vacuum leaks by following this guide with carb clean spray noting RPM change.

https://www.goldwingfacts.com/forums...osis-test.html

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post #8 of 8 (permalink) Old 07-15-2019, 07:57 PM Thread Starter
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Originally Posted by DaveO430 View Post
They don't pull a lot of vacuum, being equal is what matters. Synch has nothing to do with how it runs at 5k. Probably an ignition problem.
Thanks! I'll add it to the list to look into, sometimes it revs up just fine and strong and others you can hear it break up a bit, it has a dyna electronic ignition on it. I'll check the timing as soon as I go pick up a test light
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