Join Date: May 2004
Location: Colorado Springs, Colorado
Surging: It is running fine currently. I completely siphoned ALL the gas out of my tank. Then I removed the fuel pump and the filter, and dumped most of the rest of the gas out. The filter had some tan fibrous-looking gunk on it, but not a lot. I cleaned it all out and also cleaned the mesh screen that is below it because it had a few black particles in it. I put it all back together and was amazed when it actually started after all of that. It's running very smooth now and no more surging at all. Maybe when I was tearing it apart I "fixed" something else without even knowing it, but it runs, so I am happy.
However, I got the reply noted below from David on this web site. It's bizarre, but it makes sense.
Bob, that tan fibrous stuff is a living micro organism that actually lives and breeds in gasoline. It's a pretty amazing creature. I used to work in a research and development lab for Kiekhaefer Mercury. We had large tanks of gasoline for testing engines and it had to be treated to keep this organism from growing. The gasoline of today is supposed to have the treatment already in it but that doesn't mean it won't grow. If you had not cleaned the filter it would have kept multiplying untill it plugged it completely. We had to change filters on those big tanks at least monthly.
I bought the bike used from a guy in New Mexico. He is an avid dirt rider, so he probably has cans of gas hanging around, especially over the winter, that I hope got infected with this organism. In Colorado I have been buying gas anywhere and everywhere which means I wouldn't be able to pin-point any certain dealer or brand. After putting the bike back together again, I have only been buying Conoco gas, and so far the bike runs smooth. I just hope there wasn't some residue left in the tank that will cause the organism to grow again, because cleaning the fuel filter is NOT a fun project.
2004 DL650 - Blue
Yes, a DL650 can definitely do a major smokey burnout!!