Loss of Power at high speed - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
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post #1 of 15 (permalink) Old 06-27-2008, 03:27 PM Thread Starter
 
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Loss of Power at high speed

So I was driving down I95 cruising around 80 mph and the pavement opened up in front of me so I decided to push the old girl to see what she has left in her. I jumped up to around a 100 and then ... loss of power and stall. The only reason I really knew it happened was I stopped accelerating. So I let off the throttle and decelled extremely fast so went back wide open and headed for the shoulder. Once on the shoulder I started the bike and it stalled within a few seconds. Started thinking that I was gonna need a tow but I tried again and then she started right up like nothing was wrong. Made it home with no incident aswell.
If this, or something similar, has happned to anybody please let me know OR if you have an idea what it might be it would be very appreciated.
Also I put this thread in fuel and carbs because that is my guess what it was but not exactly sure if it could be anything else.
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post #2 of 15 (permalink) Old 06-27-2008, 03:37 PM
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Do you remember how much gas you had in the tank?

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post #3 of 15 (permalink) Old 06-27-2008, 04:05 PM Thread Starter
 
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a little less then half of a tank...
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post #4 of 15 (permalink) Old 06-27-2008, 04:07 PM
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It's the Phantom Out of Gas Syndrome that has been mentioned here as of late. We haven't found the cure yet but I'm sure someone here will find it.

Jim W
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post #5 of 15 (permalink) Old 06-27-2008, 04:10 PM
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The very first thing I'd do is a large Seafoam treatment and see if that helps.

After that, the first (and easiest) thing I'd check on the bike would be the air filters and the vent line going into the right ear.

Next would be the fuel filter (well, screen really) that is part of the petcock. Might need a new gasket if you check that.

If no problems or solutions are found there, then I'd look into the carbs.

Could also be as simple as a plugged gas tank vent.


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post #6 of 15 (permalink) Old 06-27-2008, 04:19 PM Thread Starter
 
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thanks
will check it out and let you guys know what i find
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post #7 of 15 (permalink) Old 06-27-2008, 04:23 PM
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Just in case you thought I was joking about the Phantom Gas Syndrome, (Knifemaker came up with it, not me) here is one of the threads that talk about the exact same symptoms you describe.
https://www.vn750.com/forum/showthread.php?t=7428

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
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post #8 of 15 (permalink) Old 06-27-2008, 04:30 PM Thread Starter
 
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yea after reading the other thread it sounds exactly what happened to me....willl check the tank and seafoam it up. Thanks everybody
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post #9 of 15 (permalink) Old 06-27-2008, 10:10 PM
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This happened to me Yesterday, after a hard run through the first three gears. then leveled off to cruising speed, it acted like it was running out of gas, way short of the usual distance. Then I remembered the other post about opening the fuel cap. When I got home I took the fuel cap off the bike and took it apart (5 screws) to see if something could be blocking the vent. Sure enough, there was some crud blocking a small vent. There is also a check valve in there. Maybe that was hanging up too. I thoroughly cleaned it.
Then I took another red line gear run, seemed to work fine, no fuel starvation problems.

Glenn

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post #10 of 15 (permalink) Old 06-27-2008, 10:33 PM
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keep us updated Glenn....
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