Running Out of gas - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 14 (permalink) Old 12-01-2011, 05:16 PM Thread Starter
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Question Running Out of gas

Bike idiles fine. Runs great until I get about 3-4th gear and over 40mph. Then it spudders, loss of power and seems as if I'm running out of gas. If I really gEt on the throttle it clears up till I reduce rpm and keep the throttle steady. This happens no matter what the fuel level is. Any ideas what could be going on?

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
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cam chain tightened

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post #2 of 14 (permalink) Old 12-01-2011, 05:48 PM
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First...make sure throttle cable is free and lubed..also check your air filters and carb boots and hoses to see if anything is loose, broken or leaking.

also check your spark plugs to see if they are in good shape.

if not any of those, I'm guessing the carbs are clogged or dirty. Throw some Sea Foam in and see if it helps.

I am sure you will get plenty of good advice from the more experienced guys here, but I would start there.

Good luck...let us know what you find out.

Last edited by kc2dgq; 12-01-2011 at 05:51 PM.
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post #3 of 14 (permalink) Old 12-01-2011, 05:58 PM
Crap, I WAS in 5th gear.
 
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X2 for vacuum lines to the petcock. Also x2 for clogged pilot jets.

Last edited by Kelly2001; 12-01-2011 at 06:06 PM. Reason: Fixed verbiage
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post #4 of 14 (permalink) Old 12-01-2011, 06:14 PM Thread Starter
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X2? Can u give me more info. Sorry I'm not mechanic.

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
de goat
412 progressive 11" shocks
Custom paint
NGK Iridium Spark Plugs
cam chain tightened

Coming soon:
spline lube
whitewall tires
stereopath is offline  
post #5 of 14 (permalink) Old 12-01-2011, 06:19 PM
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Quote:
Originally Posted by stereopath View Post
X2? Can u give me more info. Sorry I'm not mechanic.
Check out this stickied topic that is in regards to Phantom Out Of Gas Syndrome and see if that helps. It may not be that but a good place to start. Also him saying x2 is him also agreeing you should check out those items (vacuum lines to petcock, clogged pilot jets).

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350

Last edited by thtanner; 12-01-2011 at 06:22 PM.
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post #6 of 14 (permalink) Old 12-01-2011, 06:32 PM Thread Starter
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Ahh! Ha sorry newbe.

Also read on a different thread about rerouting the carb vent hose and replacing the gas tank vent hose. Seemed to work in a similar situation.

https://www.vn750.com/forum/archive/i...p/t-15212.html

Now I just gotta figure out where these hoses are located

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
de goat
412 progressive 11" shocks
Custom paint
NGK Iridium Spark Plugs
cam chain tightened

Coming soon:
spline lube
whitewall tires
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post #7 of 14 (permalink) Old 12-01-2011, 07:00 PM
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There is a small hose that runs into the back of the right airfilter box. This goes to a T that then runs to both carbs.

Sometimes the hose falls out, or it gets pushed in to far in the back of the airbox. Fix is to pull it out of the box, cut the end at a 45 degree angle and stick it back in..(this keeps it from bottoming out and blocking the opening)

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post #8 of 14 (permalink) Old 12-01-2011, 08:33 PM
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Check your floats. I know the "get on it" part doesn't fit, but suggest you check them. Also see if petcock vacuum hose gets soft when hot. Could collapse. Oh, look for leaks in carb boots. Had the same problem over years. Many fixes, but drives good now.

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post #9 of 14 (permalink) Old 12-02-2011, 03:03 PM Thread Starter
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I noticed the from head carb boot doesn't seem to be on al the way. Also all 4 of the rings that fasten them on where loose. Couldn't get the boot any farther on the carb side but did tighten all the rings. Didn't seem to help.

I had a friend do an ear shave and don't seem to have any hoses coming off the carbs besides the two fuel lines.

Video I shot and edited of my 1985 Vulcan VN750


mounted iphone gps for speedo and milage
custom seat mod
stator replaced
mosfet r/r
gauges and dash removed
baffles drilled
synth oil
ear shave
de goat
412 progressive 11" shocks
Custom paint
NGK Iridium Spark Plugs
cam chain tightened

Coming soon:
spline lube
whitewall tires
stereopath is offline  
post #10 of 14 (permalink) Old 12-02-2011, 04:14 PM
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Quote:
Originally Posted by stereopath View Post

I had a friend do an ear shave and don't seem to have any hoses coming off the carbs besides the two fuel lines.
Looks like you found your problem. Both float bowls have to be vented to a spot that has still air.

Perhaps he capped them off? You need to find the vent tubes and replace the system or your fuel bowl will never fill properly...making the bike act like it's running out of gas...(which it is..)

You only have two hoses going to your petcock? That's a problem too....

If You Are Not Sure If I Am Joking or Not....I AM !!Photos:
http://www.flickr.com/photos/knifemaker1954/sets/

Last edited by Knifemaker; 12-02-2011 at 04:17 PM.
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