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Drive less, ride more...
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1,114 Posts
Discussion Starter #1
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???....:confused:
 

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Now what
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400 Posts
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?
 

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HAWK
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2,576 Posts
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.
 

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HAWK
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2,576 Posts
That is not bad, just rember the Carbs are now empty and take a little to fill back up. Mine has done that before.
 

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HAWK
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2,576 Posts
You are getting great MPG, what kind of riding do you do?
 

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Drive less, ride more...
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1,114 Posts
Discussion Starter #7
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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HAWK
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2,576 Posts
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
 

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HAWK
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2,576 Posts
When mine did it it took about 30 seconds to kick back in. At 60 MPH that is 1/2 mile.
 

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and the Adventure Cycle
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6,141 Posts
Do you have a maintenance free battery?
I had the same troubles when my standard wet cell battery was a bit low on acid levels. Bike would lose power, I'd pull over and wait a few minutes, and fine for the rest of the day.
Seemed like when I got a new battery (not MF yet, maybe soon though) I didn't have the loss of power symptoms.
And it did seem to happen when at interstate speeds (60-70) more than city driving speeds (less than 50).
Also, what grade of gas do you use? Alot of folks use the higher grade stuff, but the manual recommends the lower grade. Not that that's where the problem is, but it might have something to do with it.
 

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Premium Member
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1,766 Posts
I believe that you are running the carbs out of gas, as I have done too. You need to switch to reserve before the sputtering starts. Pick a distance from the trip odometer, a mark on the gas gauge, whatever works best for you.

Should resolve your problem.

Jon
 

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Premium Member
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4,054 Posts
I'd have to agree. If you wait til it starts running out of gas, you'll have sputtering. If you slow down and sit for a minute at idle, your bowls will fill up more rapidly, but if you keep trying to gun it and go, your engine will be starved for fuel. I believe you are just not letting the bowls fill back up enough before you try to keep going. Hope that's all it is!
 

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Premium Member
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1,647 Posts
The bowls don't fill up instantly and I agree with fergy and 93, it 's taking that long to finally fill the bowls up at 60-65 mph. If you hit the throttle to pass or something, the problem will be worse. If you can, switch to reserve and pull in the clutch and let it coast for about 10-15 seconds. With the engine at idle, that's about all it should take to fill the bowls and then off you go. You'll only lose about 15-20 mph and then back up to speed.
 
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