RPM's Bottomed out on Freeway - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 28 (permalink) Old 07-09-2010, 01:18 PM Thread Starter
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RPM's Bottomed out on Freeway

I'm new to the forum, and looked all night for a similar issue but couldn't find one, so I'm hoping someone can help.

'98 VN750, CA Model. Carbs rebuilt about a year and 1500 miles ago (previous owner, I have the receipt though)

At about 70mph last night the bike randomly Bottomed out on RPM's. It did this twice within about 2 minutes, and I had initially thought I had throttled off a bit and not realized it, so I opened the throttle more, and a second later rpm's and everything was back to normal. About 2-3 miles later, rpm's bottomed out again, and the bike stalled out on the freeway. Thankfully I was able to get on the shoulder quickly without any traffic issues, and the bike started right back up without an issue. I let it idle for a few minutes, no issues. I proceeded the last few miles home without any other issues. I started it up again about 20 minutes later, just to let it idle, and a couple of minutes in, it bottomed out, recovered, then the engine quit 15 seconds later.

I have a little less than a quarter tank of fuel, and my first thought was maybe just bad fuel/dirt in the tank. Regardless, having stalled on the freeway I'm parking it until I can figure out what is going on. If anyone has any experience with this, links, ideas, or other questions about the bikes behavior (lights did stay on when it stalled, thankfully seeing as how it was about 9PM). Please let me know.

Much appreciated in advance.
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post #2 of 28 (permalink) Old 07-09-2010, 01:44 PM
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do a search for phantom our of gas syndrome

just my guess
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post #3 of 28 (permalink) Old 07-09-2010, 01:58 PM
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It could be the POOGS, see this thread https://www.vn750.com/forum/showthread.php?t=14507.

POOGS is easy to verify and fix (on non-CA models at least). Also, if it is not POOGS, then you've only spent a few minutes and can check it off the list of the possible source of the problem.


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post #4 of 28 (permalink) Old 07-09-2010, 02:29 PM
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It could also be your ignition switch needing cleaning.
Another thing to check is the vaccuum line from the petcock to the carb.
Also check that the right front spark plug is not grounding to the throttle cables.
You may want to add a little bit of water remover to the fuel tank.

Welcome to the group.

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post #5 of 28 (permalink) Old 07-09-2010, 02:34 PM
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also check that the little hose on the right Ear (filter) isnt bottemed out or all the way out.
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post #6 of 28 (permalink) Old 07-09-2010, 03:33 PM
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Quote:
Originally Posted by clock152 View Post
also check that the little hose on the right Ear (filter) isnt bottemed out or all the way out.
Preventative. Some folks have cut the end of that hose at an angle to prevent it from being sucked up against the back of the air filter housing.
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post #7 of 28 (permalink) Old 07-09-2010, 03:36 PM
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Yeah.. I had sort of the same issue but mine had backed out of the filter and at higher speeds it would almost kill the engine.. pulled my hair out on that one!
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post #8 of 28 (permalink) Old 07-09-2010, 05:01 PM
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The POOGS doesn't answer why it would die after you started it up at home and let it idle. Sounds more like a dirty ignition switch or the grounding at the front right plug wire on the throttle control cables.

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post #9 of 28 (permalink) Old 07-09-2010, 06:04 PM Thread Starter
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The bike is a CA model, does that make a difference in fixing a POOGS? The threads don't seem to say. I've been trying to check everything today, and so far nothing seems to be wrong, I started it up, and let it idle for a good while.. didn't seem to do anything wrong now, but haven't ridden it yet, may try tonight.
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post #10 of 28 (permalink) Old 07-09-2010, 09:23 PM
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there is a difference between the CA model and the rest... but the proceedure should be relatively the same.
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