Falling flat on itís face - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
VN750 General Discussion

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post #11 of 19 (permalink) Old 02-24-2020, 12:47 AM
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Checked the sidestand, clutch and neutral switches?
It will cause this same action if you are out of neutral with the clutch released and the sidestand down. Was running the bike through the gears on the center stand and found this out.

1989 VN750
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2006 Honda Rebel Diesel
100mpg, low and slow

1982 Mercedes 300D
Modified engine, 4-speed manual
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post #12 of 19 (permalink) Old 02-25-2020, 05:32 PM Thread Starter
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All right folks I’m back I had to take a week and get some stuff straight. I got back to working on it today and I figured out the issue. I’ve never had any problem running that vacuum line from the carburetor to the air filter on the right hand side like you’re supposed to do in fact all of my bikes have it in that spot because that’s were it’s supposed to be, but for whatever reason this one has decided it does not like that spot anymore so once I pulled the vacuum line out of the air filter Inlet the bike ran like a charm. There was apparently enough negative pressure coming inside that air housing to bias the carburetors
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1981 KZ750
1988 Vulcan VN750 (red)
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(2) 1994 Vulcan VN750 (red)

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post #13 of 19 (permalink) Old 02-25-2020, 06:08 PM Thread Starter
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Yep. Right here. Something is amiss, but long as she runs....... whatever. I would have fixed this on the first day but i knew it was supposed to be there. When i had checked everything i started doing things wrong for a reaction and this was what made it work.
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1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

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post #14 of 19 (permalink) Old 02-25-2020, 07:46 PM Thread Starter
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1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
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post #15 of 19 (permalink) Old 02-26-2020, 01:26 AM
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The hose passage doesn't go inside the air filter housing, its just a cleaner location to vent air than hanging loose in the engine area. Bottoming the hose is the same as plugging it, thats why performance suffers, the bowl can't fill/drain.

1989 VN750
Highway blaster

2006 Honda Rebel Diesel
100mpg, low and slow

1982 Mercedes 300D
Modified engine, 4-speed manual
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post #16 of 19 (permalink) Old 02-26-2020, 10:19 AM
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Itís been suggested here many times to cut the end of the hose at a 45 degree angle before pushing into the air filter box to prevent blocking it.

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post #17 of 19 (permalink) Old 02-26-2020, 03:21 PM Thread Starter
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Quote:
Originally Posted by Knifemaker View Post
Itís been suggested here many times to cut the end of the hose at a 45 degree angle before pushing into the air filter box to prevent blocking it.
Correct. However this issue wouldnít be relevant to that solution. Itís actually exactly how it should be and is on all my other bikes. The problem wasnít with it not flowing, it was flowing too much. Exact opposite issue. For some reason it was being super sensitive to negative pressure. Nothing changed (position wise) so no idea why. Long as she runs Iím good. I actually had some time on one of my other VNís I donít use much and gained some perspective on how my main VN is running. It could be ďquickerĒ (peppier) so Iíll have to do some maintenance like different plugs. Itís getting up there a little (36,000 miles) and the closest other one is 19k so i can see the difference in how it runs.


1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

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post #18 of 19 (permalink) Old 03-01-2020, 02:30 PM Thread Starter
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Dual cold starts on the chopped and screwed Vulcan and the kitted out daily rider.




1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
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post #19 of 19 (permalink) Old 03-01-2020, 04:08 PM Thread Starter
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Since sheís back in the 8k rpm circle i gave it a bath.
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1981 KZ750
1988 Vulcan VN750 (red)
2005 Vulcan VN750 (silver)
(2) 1994 Vulcan VN750 (red)

Engineering solutions for the VN750 Community.
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