Stutter in higher gears, GL1100

imported post

Could be:



Plugged fuel filter

Gas Cap not venting

Fuel pump heading south

Pumper diaphragm worn

Sliders sticking.



I'd check filter and gas cap first........they are the easiest. Verify thefuel pump pressure. If not them......I'd check the sliders. Make sure they aren't binding. If they have score marks on them.......hit them with some fine emory paper or steel wool and polish 'em up. If none of those get it........clean the carbs, replace parts as needed, and rebuild the pumper.

imported post

Hey cbach1981,

The gas cap vent being plugged is quite common. The “wosh” that you hear is a vacuum and not pressure. As you use fuel the tank can’t get out side air to fill the space due to the plugged gas cap. Although your fuel system is pressurized, that’s after the fuel pump. There is no pump that pressurizes the tank.

I had this problem after I purchased my 82 Aspencade. It was not until I realized after putting clues together from other posts that I fixed (or managed) my own problem.

After filling up the bike with gas, I would head out to take a bit of a ride. I found that I was not getting a very good mileage from a tank before the engine would sputter and I would have to switch over o the reserve. I would look at the gas gauge and I would still have about ¼ tank left. The carbs have never been done and the bike did sit for an extremely long time before I got it. I just thought it was gummed up carbs and had them removed, cleaned and rebuilt.

The mileage got a lot better but would still sputter around ¼ tank, especially on longer trips. Just “jigging” around town would not show this problem as bad or not at all. I just thought the gas gauge was off and was going to ask anyone if there were adjustments for this. I also noticed that the engine did not perform well when I was around ½ tank of gas. Kind of sluggish in the pickup.

Then I read a few posts about fuel issues and people hearing a “Whoosh” when they took the gas cap off. I guess it was not supposed to do that. I hear it all the time on my Toyota Echo and I never gave it a second thought. Then something clicked in that slowing down brain of mine. There was a vacuum forming in the tank. Could this be the problem??

Sure enough it was! I did several longer rides of 200km or so (which I always had the problem) and would loosen up the gas cap now and then while in flight. Instant success. The engine now sputters only when truly running out of gas. The gauge is in fact right on. The power is back on the entire tank. HA!! I am sooooo proud of my wee little brain at times!!

You can either get a new cap from Honda or soak your old one in WD40 or Seafoam for a few hours and then whacking it down firm a few times on something hard in the same direction as if it were on the tank. I did mone on a 2x4. I did that twice. Haven’t had a problem since. That’s 15 months ago and almost 10k km.

Tim.