Dogs Out doing steady speeds over 40mph - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 20 (permalink) Old 08-02-2010, 12:27 AM Thread Starter
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Dogs Out doing steady speeds over 40mph

What would cause the carbs to act like they are running out of fuel while doing steady speeds 45mph and above?
Vulcan rides great with lots of power till you get into 5th gear and steady out
the ride.
Starts dogging or chocking like she's near empty. Gets worse and she dies a mile later. Look things over and hit the start and nurse her home.
Did the air vent in tank, even ran bike with lid open and same results. Cleaned the petcock and cleaned the already clean tank filters. Clean gas coming from drains.
SeaFoam was added 50 miles ago to full tank and did nothing. Runs great till you steady speeds out at 45mph or above than dogs out eventually dying.
Only thing I can think of is carbs are out of sync. Maybe float(s) sticking?
Sqirt gumout up carbs drain butt? Ideas???
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post #2 of 20 (permalink) Old 08-02-2010, 12:47 AM
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Not sure?
Maybe carb vent hose to right airfilter box has fallen out, or pushed in too far and is blocked?
Check it, and cut end off at 45* angle before relacing it into filter box to prevent it from ever getting bottomed out and blocked.

Gordon

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post #3 of 20 (permalink) Old 08-02-2010, 12:56 AM Thread Starter
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Are you talking the hose that runs on top of right carb to the air box above that?
Noticed it didn't have a grommet end! Hmmm, yet another manufacture defect!
Let me know if that's the hose you be referring too and I'll cut to 45 degrees and see what happens.
Thanks for your input.
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post #4 of 20 (permalink) Old 08-02-2010, 01:07 AM
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See Crobins post #9 in link below.
https://www.vn750.com/forum/showthrea...carb+vent+hose

I haven`t got under there yet myself to see exactly where it comes from, but from what I can see in diagrams the hose comes off a "T" from both carbs and goes to the filter box.

I just pulled the ears off my bike yesterday, and the hose just fits into the plastic cylinder with a full length slot in it. There is no grommet needed that I am aware of.

Do a search on the words "carb vent hose" for several more threads on this topic.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #5 of 20 (permalink) Old 08-02-2010, 01:15 AM Thread Starter
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Oh, at the "T"
Had a feeling it was a common issue. Just couldn't find the forum post.
Must have worked for Mitch!! He never replied.. lol

Thanks for the link and verification..
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post #6 of 20 (permalink) Old 08-02-2010, 01:27 AM
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Good luck with it.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/showthread.php?t=9127
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post #7 of 20 (permalink) Old 08-02-2010, 01:54 AM Thread Starter
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Well, Am getting "T"'s confused. Am sure you are referring to the smog control "T" and the elbow hose that's pressed between top of right carb and the plastic air thing.
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post #8 of 20 (permalink) Old 08-02-2010, 02:19 AM Thread Starter
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Okay, followed other forums.. Found the two hoses coming from carbs leading into a "T"
After the "T" it goes into the purge tank!!
My Vulcan's a blasted California model!!

What about the hose with no grommet leading to to the air box above carbs? One I'm looking at is on the right side pressing up on top of right side carb fitting in air box.
Is that the one to cut at 45 degrees?
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post #9 of 20 (permalink) Old 08-02-2010, 08:31 AM
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Quote:
Originally Posted by Padrick View Post
Okay, followed other forums.. Found the two hoses coming from carbs leading into a "T"
After the "T" it goes into the purge tank!!
My Vulcan's a blasted California model!!

What about the hose with no grommet leading to to the air box above carbs? One I'm looking at is on the right side pressing up on top of right side carb fitting in air box.
Is that the one to cut at 45 degrees?
Yes that is the one to cut at a 45.

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post #10 of 20 (permalink) Old 08-02-2010, 09:51 AM
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Also make sure that the vaccuum hose from the petcock is in good condition. That meaning that it is not cracked and leaking air in.

02 honda sabre 1100
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