Bike won't start after sitting for a week. Not the battery.

[Thermite]

Did it drop dead at idle or under way?

If it just dropped dead without a sputter while you were moving it's almost certainly electrical.  The relay Howie mentioned has gone south on both of my Ducs.  Intermittent fail a couple times followed by total failure.

[iltl32]

It just cut out all at once, no sputter.  The dash lights stayed on.

Not sure where my last Reply went, sorry if this is double.

I did put fresh gas in it.  I did confirm we have spark.


I have not drained the tank, or checked the fuel pump or filter, because of the following: from what I understandt here is an o-ring that has to be replaced every time you open up the tank.  I don't live close to a dealer, so I need to hunt parts down, order them, and then wait a week and hope it's the right part.  So in short: I'm trying to avoid opening the tank if I can.  Correct me if I'm wrong on the o-ring bit, it's just what I've read.

I've heard the most probable point of failure is the relay(s) next to the battery, so I ordered 2 new ones.  Should be here Friday.  I know you shouldn't just throw parts at it, but they were like 5 bucks each so it's worth a shot.

If the relays don't fix it, the next step will be to open up the tank and check everything I guess.


I found the official shop manual for the 2004 M620 Dark, I'm assuming everything is the same as the '05, and it doesn't give a mileage for replacing the fuel filter.  It recommends cleaning the fuel tank every 20K miles, though.  Where were you able to find out about the fuel filter mileage?

[Howie]

You are correct, they show no filter change interval in the maintenance table, it was 6K on the carbies.  Probably because the filter is in the tank.  Spending a ten spot on relays is no biggie.  Replace them and go for a ride.  Anew O ring is not mandatory, but highly recommended.

[iltl32]

The relays didn't help.  It turns out there is a dead wire in the fuel flange.  The pump works fine but the red wire feeding the pump seems to be broken somewhere.  I made a new topic in Tech with the details since this is, I think, now a different issue.  Check it out if you like, and thanks for your help.

Link: http://www.ducatimonsterforum.org/index.php?topic=60204.0