Carburetor Vacuum Leak - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 4 (permalink) Old 04-22-2019, 02:29 PM Thread Starter
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Carburetor Vacuum Leak

I have a few questions about the attached picture.

While cleaning my carbs, I took this cover off from my rear (right side) carb.
I realized I didn't need to remove it, so I put it back on and did not remove the front (left side) one.
Now I have a vacuum leak from this cover.
The screws are tight, but I can change the sound of the air woosh sound by pushing on the cover.
Also, spraying this cover with fluid causes the engine to bog down.

First question, what does this assembly do?

Second question, is 92055A part of this assembly?
It's not clear where it is supposed to go.
I don't recall seeing one when I took it apart.
I may have put it around 13091 when I reassembled...that could be a problem.

Third question, can I put the cover on an seal the cover with RTV?

Edit: The picture is hard to see.
Go to https://www.kawasakipartshouse.com/o...rburetor-parts for a zoomable diagram.
The parts in question are 223, 14024A, 92055A, 92081C and 43028.
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'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
22490.0+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance

Last edited by Jason Pittenger; 04-22-2019 at 02:45 PM. Reason: Picture too small, and hard to see
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post #2 of 4 (permalink) Old 04-22-2019, 05:38 PM
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That's the Coast Enricher. Take the cover off and see if everything is in place correctly.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
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post #3 of 4 (permalink) Old 04-23-2019, 04:34 AM
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I had problems with the diaphragm in there on both carbs several years ago. They were melted. I believe it was caused by ethanol gas. Part# 43028 DIAPHRAGM,AIR CUT VALVE I believe the edge of that diaphragm is what seals the cover. If not, there would be an O-ring behind the cover. In fact there is a tiny O ring behind the cover. Remove it again and check the parts diagram and make sure you have all the parts. And check the condition of the diaphragm. If it looks good, make sure it is seated in the groove all the way around.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike
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post #4 of 4 (permalink) Old 04-23-2019, 08:03 AM Thread Starter
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I started it up last night and reconfirmed it had a leak at that cover by spraying it.

I pulled the cover and discovered the o ring WAS missing. Oops! It must have fallen out when I opened it during cleaning, and didn't notice. I had an extra of that size so I put one in and reset my idle screws.

I must have flooded the engine with the spray because it wouldn't start. I got some nice fire balls out the exhaust, and a few loud bangs that I thought was going to blow off the exhaust! It was exciting...

I thought you could clear out a flooded engine by cranking it with a full throttle, but alas it just kept banging and spitting fire. We'll see how it starts/runs today.

Edit: It started right up with a little choke and 2 and 1/2 turns on this screws. I backed out to 3 and 1/2. 4 and 1/2 turns caused a dip in the idle so I went back to 3 and 1/2. I rode it around the block and it seems healthy. It's too cold to ride to work though today. I should be able to ride it to work tomorrow.

Here is a video of it idling in my garage. With good headphones, it sounds just like you're standing in my garage.
https://photos.app.goo.gl/5cgKYfoixw6oBEWn8

Thanks!


'89 Vulcan 750 Bought 4/12/18 @ 17805.9 miles $800
Purchased stock. Wrecked once
22490.0+ miles

Completed modifications:
Removed mufflers, straight pipes out of GB
110/90 Front Tire
Pick-up coil re-gapped to .020"
Compufire 55402 r/r series regulator
USB Outlet + Voltmeter
Repainted Metallic Blue w/ new tank bages
Ear Shave (wo/ coasters) 40/140 NO shims 45MPG
MCCT conversion

Planned modifications:
Custom LED turn signals
Windshield
Highway Pegs
(Possible) ignition advance

Last edited by Jason Pittenger; 04-23-2019 at 08:57 AM. Reason: New information
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