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Discussion Starter #1
Riding along yesterday at about 40 mph in 95 degree heat, all of a sudden the bike does a major hesitation for about 2 or 3 seconds, and then will barely run under 5000 RPMs with EXTREME surging. It idles fine and runs fine over 5000 RPM.

I have no clue as to what could cause this.
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2004 DL650
 

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Discussion Starter #3
I had filled up about 75 miles before that happened.

I've been meaning to ask if fuel injected systems can suffer from vapor lock. I didn't think they could but had been getting other symptoms that seemed like vapor lock.

So, now I guess I know that it does happen.
 

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Discussion Starter #4
Another odd thing that happened with this was that the idle dropped 400 RPMs. I made a short test run tonight to see how it ran after cooling down for 24 hours and it ran fine, but the idle change seems odd.

Any ideas on why that happened?
 

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I know you can vapor lock some fuel injection systems, but I have not heard of this on a Strom. It just seemed right for the symptoms.

Go for long ride above 6k RMP and then get some new gas.

Please keep us posted.
 

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Discussion Starter #6
Mattman--that's why I took this ride. It was 250 miles minumum. I thought it would clean out the whole system. Instead it messed it up somehow.

I tore the whole engine apart today. Checked the valves. They are barely within tolerance, at the lowest end.

Spark plugs, air filter, etc. all seem OK.

I don't have enough know-how to mess with the fuel injection; and neither do the local dealers.
 

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I just saw your other post in the 650 section. I thought this was a new issue until reading that post.

Now I have no ideas exept for the fact there have been a few iginiton (plug cap/coil) issues on some bikes. I think these issues have all been on 2005 bikes though (?????).

I had a bad set of plug caps and by bike had hessitation, bad idle and chunky throttle at low (<5k) rpm under moderate loads. Nothing that caused loss of power for 2 or 3 seconds though.
 

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Discussion Starter #8
About the other post-----after I posted it, I realized that it is probably a "general" problem not specific to the 650, so I re-posted it in this section.

Sorry about the confusion, but as far as I know I can delete a post.
 

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Discussion Starter #10
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.
David


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.
 
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