Join Date: Nov 2012
Location: Melbourne, Australia
Fuel pump or something else?
Sorry for the War and Peace below, but I hope someone can shed some light on this issue...
So a few months ago I heard this constant whistling/whining noise when my 2005 DL650 (clocked just over 50k, regularly serviced) was idling. The mechanic said it might be the fuel filter, but he also said the filter would not catastrophically fail all of a sudden. This sound sort of came and went and since I wasnít experiencing any other issues or loss in performance whatsoever (not even in top RPM) I didnít think too much of it and though Iíd deal with it as soon as I start noticing a loss in compression.
The whining noise eventually completely disappeared, and the bike was fine. Then, a bit later, it would be idling fine at around 1,100 RPM, nice and steady, and it would sometimes suddenly drop back to around 750 RPM, idling terribly, sometimes even stalling. Still, if I turned open the throttle it would still rev just fine. Just idling was the problem. Just as the problem came, it went, going back to 1,100 RPM Ė no issues. Back to the mechanic for a service and to get it checked out, but he couldnít diagnose the problem as it was running fine during the test rides. So I recorded a few short videos of the issue when it happened after the service (from fine, to worse and stalling to barely being able to keep it running).
Up until last month, when it became unrideable. Running inconsistently, little puffs of smoke coming out of the exhaust and as soon as I let go of the gas it would stall. About to take it to the mechanic and now it wonít start at all. Starter motor is turning but thatís it.
Does anyone have any idea what the issue is? Is it the fuel pump, even though I didnít have a loss in RPM, or is it something else? I uploaded the videos as they give a pretty good impression of whatís wrong. I would love to post them, but I can't post any links as a newbie...