Jim Moore Posted May 5, 2009 Posted May 5, 2009 Folks, I have an '02 GS with 101,000 miles on it. Yesterday as I was riding in wet conditions, I noticed a very slight power loss several times. The bike would slow down 2-3 mph for a few seconds, then it would return to normal. It was so slight that at first I thought I had loosened my grip on the throttle. The bike never really hiccupped, and I was always able to power out of it. Strange. Luckily (sorta), the bike ran perfectly today on my return trip. I'm not sure where to start looking for the problem. I'm going to spray some water on it while it is running to see if I can get it to act up. My first thought is the HES, but I'm not sure because all the HES failures I have heard about have been dramatic. This was not. I don't think it was the fuel filter, since it ran great today. Also, I've had a clogged fuel filter before, this was not the same. Could it be plug wires? Could the water cause a temporary short which allowed the bike to run, but at slightly less power? My other thought is a tankful of bad gas. Any ideas? It has recently had a tune up and fuel filter change.
ShovelStrokeEd Posted May 5, 2009 Posted May 5, 2009 Jim, When my '94 started acting like that I too was stumped. Took the bike apart down to the tank and found the wire screen on the inlet to the fuel pump had clogged with crap and the pump itself to be bad. It would spin OK and didn't make any more noise than normal but it also would not maintain consistent fuel pressure depending on flow requirements. Might be worth a look.
Jim Moore Posted May 5, 2009 Author Posted May 5, 2009 That's interesting, thanks. I think I may start with something a little simpler though.
Matts_12GS Posted May 5, 2009 Posted May 5, 2009 Jim, Since you have an external fuel filter, it may be easy enough to drain the tank and try a new tank of gas and a new filter. I am wondering more if you have a high mileage HES that has the insulation breaking down and maybe it was just starting to arc a little instead of completely shorting?
Jim Moore Posted May 5, 2009 Author Posted May 5, 2009 I am wondering more if you have a high mileage HES that has the insulation breaking down and maybe it was just starting to arc a little instead of completely shorting? That occurred to me. the 1150 is supposed to be a little better in that regard though.
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