Strange behavior while on reserve - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 11 (permalink) Old 02-16-2007, 06:22 PM Thread Starter
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Strange behavior while on reserve

Recently, while doing some afternoon riding, I switched the bike over to the reserve part of the tank.

I did this while on the way home, from out of town.

After switching over to reserve, and at highway speeds, the bike rpm's drop, and finally the engine quits.

This happens 3 or 4 times. Each time, I'm able to restart the bike (but only after several tries), and I finally make it home.

After making it back home, I first add 4-5 ounces of Seafoam to the tank, then top off the tank, and let the bike sit for 3-4 days.

Yesterday, I rode the bike (but with the same full tank of gas) nearly 50 miles, this time with no problems (but obviously I didn't mess with the reserve).

Any suggestions why the bike takes on a sinister personality while on reserve?.....
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post #2 of 11 (permalink) Old 02-16-2007, 07:05 PM
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I hate to offer this, but it's happened to me (and others) on the Forum - make sure you're really going to reserve and not "off." For some reason, it feels backwards on the 750 - and more than once I've shut down my bike.

Anyone else out there want to 'fess up?

C
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post #3 of 11 (permalink) Old 02-16-2007, 07:30 PM Thread Starter
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That's a good point, but....I learned that lesson a while back.

This time, I had the petcock lever pointed forward (i.e., "push forward to go forward").

Anyway, if I had the reserve lever turned the other way (towards the rear), I figure it shouldn't have let me restart the bike (this setting would have starved the carbs)....

FYI: the bike is an '05 model, with less than 4,500 miles. I'm the 2nd owner.

And yes, it has a MF battery in it.....

Any other suggestions, anyone.....?
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post #4 of 11 (permalink) Old 02-16-2007, 07:30 PM
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When you switch to reserve it can take a second to fill the bowls of the carbs. If you wait ti switch till you feel the bike sputtering that will happen, When you are at highway speeds you are using the remaining fuel faster that it can be replaced.
Once the bowls are full all is good.
Have you tried switching to reserve with a full tank and see what hapens?
Just rember to switch it back or you might run out of gad and be stuck with no reserve.

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post #5 of 11 (permalink) Old 02-16-2007, 09:38 PM Thread Starter
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Thanks, Cc....no, haven't tried running on reserve with a full tank.

But the engine stalling problem happened well after I switched the petcock lever forward. After I went to reserve, I threw in the clutch, and closed the throttle for about 10 secs or so, for it to "catch up" so carbs wouldn't starve (I learned to do that part earlier).

Am I chasing a ghost, here?.........
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post #6 of 11 (permalink) Old 02-16-2007, 09:48 PM
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You may want to pull the petcock and see that there isn't something partially clogging the pickup for the reserve. About the only thing left you haven't checked.

Jon

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post #7 of 11 (permalink) Old 02-17-2007, 10:43 AM
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i say check the reserve lines, sounds like a clog.... you may wanna try a high dose of sea foam with a li gas to fill the reserve lines overnight

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post #8 of 11 (permalink) Old 02-17-2007, 09:23 PM
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I have had sputtering when switching to reserve at freeway speed. I think water and other undesirable things collect at the bottom of the fuel tank. Now I leave mine on reserve at all times, and never have that problem anymore.
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post #9 of 11 (permalink) Old 02-17-2007, 11:42 PM Thread Starter
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Hizzo...Dan....I think I'll try both your ideas, in the order listed above.

If those don't work, I'll scrutinize the petcock closer as you suggested, Jon.

Thanks!!!!......
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post #10 of 11 (permalink) Old 02-18-2007, 01:01 AM
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Check that your battery cables are tight. The bike acts like it's possessed when one of them gets loose.

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