Vacuum Hose From Air Box - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 19 (permalink) Old 02-12-2014, 02:19 PM Thread Starter
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Vacuum Hose From Air Box

I have a 94 vn750A. The PO put V&H's on it but didn't take care of the backfiring issue. I spoke with Dynojet who informed me that a carb kit is not available for this model. He went on to say that if I plug the vacuum house on the left side of the bike coming off the airbox it would solve my issue and make the bike perform better. Problem is, I'm new at this and don't know what to look for. Any help is much appreciated.
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post #2 of 19 (permalink) Old 02-12-2014, 02:56 PM
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There is no vacuum hose off the left airbox I know of. There is one that goes to the right airbox, but blocking this will close the vent to the carbs and the bike won't run right.

When you say backfiring do you mean "popping" on de-accelleration? If so...

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post #3 of 19 (permalink) Old 02-12-2014, 03:32 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by Knifemaker View Post
There is no vacuum hose off the left airbox I know of. There is one that goes to the right airbox, but blocking this will close the vent to the carbs and the bike won't run right.

When you say backfiring do you mean "popping" on de-accelleration? If so...

Search "marbling".

Backfiring......
V&H exhaust..... Goat belly removed.... correct ?


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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post #4 of 19 (permalink) Old 02-12-2014, 03:33 PM
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Coasters, or marbling and adjust the air screws

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post #5 of 19 (permalink) Old 02-12-2014, 03:38 PM Thread Starter
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It does intact backfire like crazy on decel, and I'm not sure what a goat belly is but if you mean baffells, yes they were removed.
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post #6 of 19 (permalink) Old 02-12-2014, 03:40 PM
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If you've got v&h exhaust your goats belly is gone.the goats belly is kinda like an h pipe to equalize the different length stock pipes.

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1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #7 of 19 (permalink) Old 02-12-2014, 03:44 PM Thread Starter
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Ok old dirty doc I'm pretty sure I know what you're talking about and yes it's gone.
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post #8 of 19 (permalink) Old 02-12-2014, 03:46 PM
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Yes cause the v&h the back cylinders exhaust comes under the bike were the belly should be and both muffler are on the same side

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1986/5 Vn700/750 Frankenfook cross eyed bitch "Mellisa Fayhe"
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lowered with progessive 412 10" shocks
rejetted for K/N Pods part#rc 2340
sportster seat

'I didn't lose my mind.i gave it away

BRING BACK WOLFIE."Peace and Carrots"RIP
"And I'm free...as a bird"John Lennon Free as a Bird
"I only carry when I have my pants on"Joe Robinson RIP aka Old Dog
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post #9 of 19 (permalink) Old 02-12-2014, 03:51 PM Thread Starter
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No my mufflers are still split one left one right.
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post #10 of 19 (permalink) Old 02-12-2014, 03:53 PM
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Quote:
Originally Posted by Franky Jay View Post
Ok old dirty doc I'm pretty sure I know what you're talking about and yes it's gone.
Lack of goat belly will definitely create backfiring issues....listen to these guy's for attempts to resolve.


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
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