Loses power on reserve - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 15 (permalink) Old 11-19-2006, 07:39 PM Thread Starter
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Loses power on reserve

Greetings again, everyone....!

Bike is an '05 750, with about 3,400 miles on it.

After I throw the reserve switch forward, the bike sputters, hesitates and loses power.

I "nurse" it thru this period by downshifting to 4th, and then back up to 5th.

The bike and I go thru this for maybe 5 to 10 miles (at interstate speeds), after which I got tired of it, and pulled over.

After I pulled over, it seemed to idle ok.

Got back on the interstate, and the problem went away.

This is the second consecutive time I've treated the tank with seafoam, and the second consecutive time I've gone on reserve during the seafoam treatment--with the above misbehavior.

During the rest of the reserve tank, the bike runs fine (up to just past 160 miles), at which point I top off the tank.

Afterwards, the bike runs fine again (just like before).

Any suggestions, anyone???....
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post #2 of 15 (permalink) Old 11-19-2006, 07:52 PM
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It's weird that it only misbehaves for 5-10 miles after going to reserve. Then it's ok for the rest of the tank. Sounds like air in the tube going from the tank to the valve, or maybe something in the valve itself. If the pickup filter were clogged,or anything else between the pickup and the carburetor, it wouldn't run properly at all on reserve. Maybe you need to remove the tank and inspect the fuel hoses, remove the valve and check it out too. Notice any leaks or cracks around the valve?

'04 750A- and loving it!
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Using a Purlator One PL14610
"Sixth gear? I don't need no stinkin sixth gear!"
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post #3 of 15 (permalink) Old 11-19-2006, 07:53 PM
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Do you wait to switch to reserve until the bike is running out of gas or before? If you are waiting it takes a second for the carbs to fill back up.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #4 of 15 (permalink) Old 11-19-2006, 08:09 PM Thread Starter
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The bike is fairly consistent in needing reserve at about 137-138 miles.

At that point, I'll wait 'til the bike starts to hesitate a little bit, and then work the switch forward.

Or should I be doing the above differently, somehow?....
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post #5 of 15 (permalink) Old 11-19-2006, 08:34 PM
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That is not bad, just rember the Carbs are now empty and take a little to fill back up. Mine has done that before.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #6 of 15 (permalink) Old 11-19-2006, 08:35 PM
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You are getting great MPG, what kind of riding do you do?

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #7 of 15 (permalink) Old 11-19-2006, 08:51 PM Thread Starter
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Do you really think that's all that great for gas mileage?...

I don't ride slow, but I don't really ride fast, either.

Most of that last tank was done between 60-65 mph, with some around town driving, as well. Usually (but not always) I keep the revs at/under 5k rpm, before shifting gears.

I'm using a fully synthetic engine oil (10W-40), from Mobil. It's formulated for bikes (has the "JASO" rating).

After topping off the tank, and running the math, the mileage on this last tank was 48.4 mpg.

With regard to the stumbling problem I described above...do you think another treatment (or two) of seafoam would take care of it???...
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post #8 of 15 (permalink) Old 11-19-2006, 09:05 PM
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If it is stumbling due to running out of gas, Seafoam won't help. Maby turn to reserve earlier. I don't like to go to reserve if I can help it. I fill up at about 120 miles, 2.7 gallons

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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post #9 of 15 (permalink) Old 11-19-2006, 09:32 PM Thread Starter
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That's true, but after switching to reserve, it shouldn't hesitate and lose power for that long....
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post #10 of 15 (permalink) Old 11-19-2006, 10:33 PM
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When mine did it it took about 30 seconds to kick back in. At 60 MPH that is 1/2 mile.

Chad Falstad "Hawk"
Vroc #17649
2011 HD Ultra Classic "angel"
2001 Nomad 1500 Sold March 2012
2001 VN 750 "Sold June with 2008 with 21,000""Serinity"
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