WOT in top gear = 58 mph??? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 10-09-2011, 03:03 PM Thread Starter
Jackie Chan Stunt Double
 
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WOT in top gear = 58 mph???

Kind of at a loss here...hopefully one of you has some insight into what's wrong. I was riding yesterday, bike running great, down the interstate doing about 65-70mph. Fuel gauge reading just off the "F" and which would be correct as I have only gone about 65 miles since fill up. Out of nowhere, she starts stumbling a little, like the beginning stages of running out of gas, or when the battery cables are not tight. But it is intermittent, as she bogs a little, then picks up and runs right a few seconds, then it happens again. This progresses in the span of about a minute into full blown "bike died" as I am pulling onto the shoulder. I open the fuel tank, and the tank is indeed almost full. I try to restart and she turns over fine, but no start. Switch it to reserve, same result. Put it back to the "on" position, try cranking and it does eventually start. Revs fine, no lag, nothing wrong.
Put her in gear and start to pull off, and under load, she bucks like she is misfiring and has all the power of a 50cc moped. I go through the gears to get to the next exit so I can get off the interstate and, under WOT, achieve only 58mph max. She is firing on both cylinders as I can hear both pipes barking like they do when I am running it hard. In fact, just short of WOT is the only way to keep any momentum. However, when I get off the interstate, she runs fine. Does not die, revs just fine to 5 or 6K rpms, which is where I quit revving, so presume it would have gone higher had i twisted the throttle that far.
Plugs look fine, and were replaced about 6 months ago. I originally thought maybe it was the R/R crapping out as I have read about some of the stuff happening to others on the forum, so perhaps it was the spark plugs were not getting enough voltage to fire correctly causing a constant misfire. However, with it revving fine under no load and idling normally, it did not really stack up. Ditto for trash in the carbs, which should have nothing wrong at all since the tank and fuel lines were flushed out, and the carbs have been cleaned. Headlight works, all the are gauge lights are bright...nothing out of the ordinary with the electrics I can find, and I have a Yuasa AGM that is about a year old. Gas was from a 5 gallon container I had previously filled up with and ridden out with no problems within the previous week.

Can somebody offer some insight? My Vulcan has turned me into a "Do-it-yourself-er" and I have moderate troubleshooting skills, but I confess some of the maladies confound me. Thanks.

You are unique. Just like everybody else.

2000 Vulcan 750

Re-padded and modded seat
Spline and final drive lube
Bridgestone Exedras
Flat black repaint
Saddlebags
Highway Pegs

Planned:
LED Brakelight
Rear Luggage Rack
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post #2 of 11 (permalink) Old 10-09-2011, 03:12 PM
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I would start by making sure that the feul tank vent is clear.

02 honda sabre 1100
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post #3 of 11 (permalink) Old 10-09-2011, 05:33 PM
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Are you sure there is no way it could be water in the gas, or the POG syndrone...???
Have you checked that it is not a California bike, I bought my 06 new in Tenn. and it was, and gave me fits till I fixed it... Did the gas tank have 2 rear vent lines (Cal. Mod. = 2)...??? Or did the 2000 Cal. Mods. have them then...
Just suggesting throwin some things out at you...
Have a good one...Old Dog...

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post #4 of 11 (permalink) Old 10-09-2011, 07:23 PM
If only it had 6th gear..
 
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If your ignition was at fault, you should see evidence in the spark plugs and you said they look normal. I still think you've got some trash in your gas lines probably screwing with your main jets. You would be able to rev it more in neutral because you're not using a lot of gas doing that. Under a load takes quite a bit more though so that's when you'd experience the problem. Might want to take your petcock out at some point and peek at the screen. I know mine was disintegrated and allowed crap into my carbs. Good luck.

Dave

Mods:
Jetted, shaved & coastered
Home made under-tank single filter
Converted ACCT's to manual (thanks wib714)
Dual vac lines on petcock (my cure for ticking)
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Relocated helmet lock to license plate

Added stuff:
Customized hard bags w/ lights
Chrome levers
Hellcat windscreen
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Home made 'Vita-Volt' meter
Foot rests on engine guard
Tunes

Hmm....she was on the back when we left.... ??
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post #5 of 11 (permalink) Old 10-09-2011, 08:45 PM Thread Starter
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i had the petcock out a few months ago when I flushed the tank and had the carbs cleaned, and the screens looked fine. I got to thinking about it and I just got back last Monday from a trip out of state. Went about 600 miles and each time I stopped for gas, she did not want to start back up. It took several attempts to start again, and at one point acted like it might be flooded. I rolled the throttle and cranked and a big flash of fire shot out of the pipes (scared the crap out of me and the guy I was riding with). After a couple more cranks she started up. Each time afterward, nary a problem with power or running, but I figured when I got back I would look into it since it has not happened before.
Don't know if it is connected, probably is, so putting it out there.

You are unique. Just like everybody else.

2000 Vulcan 750

Re-padded and modded seat
Spline and final drive lube
Bridgestone Exedras
Flat black repaint
Saddlebags
Highway Pegs

Planned:
LED Brakelight
Rear Luggage Rack

Last edited by Fiveo; 10-09-2011 at 08:46 PM. Reason: misspelled word
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post #6 of 11 (permalink) Old 10-09-2011, 11:25 PM
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Yea... those big " LOUD BOOMS " gets everyones attention.

(Me knows from experience too, KABOOM, OMG, did i just wet my pants?
That happens when ya get past the age of 60)


Vulcan #1 1993 - 28K
Vulcan #2 1999 - 26k
It All Comes Down To 3 Things:
#1 Fuel
#2 Spark
#3 Mechanical
Any One Fails - Then It Dont Run

____________________________________

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Last edited by OldHipWesTex; 10-09-2011 at 11:29 PM.
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post #7 of 11 (permalink) Old 10-10-2011, 10:07 AM
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I'm thinkin' POOGS 5-0.
I keep my fuel tank ventilation clean, and I still have exactly what you are describing (minus the starting issue) once in a blue moon.

Read up on POOGS and the carb vent system. Also, I suggest iridium plugs and the ignition coil pick-up mod to cure the hard starting issue.

Good luck ...

~~C8> Ratt
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post #8 of 11 (permalink) Old 10-10-2011, 11:57 AM
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Sounds like a fuel issue to me. Could you have gotten a bad fuel load when you filled up? If not, you may want to check the vacuum supply to the petcock for leaks. You may also want to check the condition of the diaphragm and filter in the petcock. If you have compression and spark, the only thing your missing is fuel.
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post #9 of 11 (permalink) Old 10-10-2011, 01:57 PM
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I agree with the "fuel issue" comments. Have you tried a Seafoam treatment yet? I would start there, as it is one of the easiest and cheapest possible remedies.

Good luck : )

AZ Kev

Arizona Kev

1989 VN750
7800 orig mi when purchased Jan 2011
Turned 11,000 mi Nov 2011
Saddlebags
Taillight relocation kit
Chad's highway peg mounts
Emgo Pegs
Aftermarket mirrors
Dunlop D404's

Otherwise, all stock


"But it's a dry heat - like the inside of an oven"
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post #10 of 11 (permalink) Old 10-10-2011, 02:22 PM
..have a vulcan good day!
 
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Quote:
Originally Posted by dodger View Post
Sounds like a fuel issue to me. Could you have gotten a bad fuel load when you filled up? If not, you may want to check the vacuum supply to the petcock for leaks. You may also want to check the condition of the diaphragm and filter in the petcock. If you have compression and spark, the only thing your missing is fuel.
X2 for dodger

'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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