Cranky Norge

[Huzo]

I have pondered a particular feature of my Norge, which has developed over the last couple of years.
If I leave the bike for 3 or more days, it cranks a bit too long before it fires up (about 6 seconds or so) and when it does fire, it idles perfectly.
After running for as little as 5 seconds, I can shut it off and then hit the starter again and it fires immediately.
It is not a battery issue, because I have left it on a charger overnight to test that theory and it makes no difference.
The TB’s are well balanced and TPS is at 4.6.
The CO trim is at 6.
It really is a function of how long it has sat since the last start but again, if I leave it 5 days and it is slow to fire up, 3 seconds running and it will then re start immediately.
I have a new fuel pump and filter going in, as I wonder if it is a bit slow to bring the fuel pressure up.
Some injector cleaner could be advantageous as well. I have been away for a week, so I will shoot a video upon my return.
I have an apparatus to re set the sacred screw, but I need a set of unmolested TB’s to calibrate the manometer first.
Any ideas ?
Oh BTW..
If y’all are wondering why I need to reset the sacred screw, these are a set of almost new ones that have been molested.

[guzzisteve]

That's what happens to old bikes, how many miles? Just be lucky it runs, still.

[Bulldog9]

I have pondered a particular feature of my Norge, which has developed over the last couple of years.
If I leave the bike for 3 or more days, it cranks a bit too long before it fires up (about 6 seconds or so) and when it does fire, it idles perfectly.
After running for as little as 5 seconds, I can shut it off and then hit the starter again and it fires immediately.
It is not a battery issue, because I have left it on a charger overnight to test that theory and it makes no difference.
The TB’s are well balanced and TPS is at 4.6.
The CO trim is at 6.
It really is a function of how long it has sat since the last start but again, if I leave it 5 days and it is slow to fire up, 3 seconds running and it will then re start immediately.
I have a new fuel pump and filter going in, as I wonder if it is a bit slow to bring the fuel pressure up.
Some injector cleaner could be advantageous as well. I have been away for a week, so I will shoot a video upon my return.
I have an apparatus to re set the sacred screw, but I need a set of unmolested TB’s to calibrate the manometer first.
Any ideas ?
Oh BTW..
If y’all are wondering why I need to reset the sacred screw, these are a set of almost new ones that have been molested.

Huzo, I think its a fuel pressure issue. As the bike sits, pressure bleeds back into the tank (though could be injectors). It takes a few moments for the pressure to rise. This happens on most of my FI vehicles. I will cycle the key on once or twice to let the initial run of the pump repressurize the system. You can hear it change after the 2nd or 3rd. ALways fires up without issue when I do this. 

[pehayes]

Huzo:  Any chance  you have old/original fuel lines which might be cracked?  A very minor crack might bleed some fuel while running but you wouldn't see or smell due to the constant flow of air over the moving bike.  That same tiny crack might leak a lot of fuel when it sits for a few days.  Thus, the final fuel lines might have air and not fuel.  Preemptive changing of fuel lines might solve it.

How about a test?  Turn the key on and off several times without hitting the start button.  Each key duty cycle should run the fuel pump and will help to fill hoses and build fuel line pressure.  Then it might start instantly.

Otherwise, use it every day!  :-)

Patrick Hayes
Fremont CA

[SemperVee]

 Huzo, mine acts the same when it has sat for a while.  When I am riding my 07 regularly it starts up fine. *So there is that, perhaps just part of the personality? 

[Huzo]

That's what happens to old bikes, how many miles? Just be lucky it runs, still.

Nah mate. At 30,000 km, I did a ride up to Tarcutta which is 496 km, I got there on one tank and it took 21.8 litres.
I did the same trip at the same (legal) speed a year ago with the bike at 220,000 km. I still got there on one tank, if the bike was losing power or any other thing was wrong, it would not have done the distance, the miniscule extra throttle setting for the worn engine would have resulted in a greater fuel consumption and consequent fuel exhaustion.
There is a more definitive answer I’m sure.

[Huzo]

Huzo, I think its a fuel pressure issue. As the bike sits, pressure bleeds back into the tank (though could be injectors). It takes a few moments for the pressure to rise. This happens on most of my FI vehicles. I will cycle the key on once or twice to let the initial run of the pump repressurize the system. You can hear it change after the 2nd or 3rd. ALways fires up without issue when I do this.

Ok mate, I am buoyed by that response. As mentioned, I have a new pump and filter to go in.

[Huzo]

Huzo:  Any chance  you have old/original fuel lines which might be cracked?  A very minor crack might bleed some fuel while running but you wouldn't see or smell due to the constant flow of air over the moving bike.  That same tiny crack might leak a lot of fuel when it sits for a few days.  Thus, the final fuel lines might have air and not fuel.  Preemptive changing of fuel lines might solve it.

How about a test?  Turn the key on and off several times without hitting the start button.  Each key duty cycle should run the fuel pump and will help to fill hoses and build fuel line pressure.  Then it might start instantly.

Otherwise, use it every day!  :-)

Patrick Hayes
Fremont CA

Good input Haysie, (that was a good drink we had at Mandello…)
I will drill into that a bit.