Reason for stalling?

[stopintime]

What actually happens / doesn't happen upon stalling a bike?

Fuel / air / spark - too much / too little

I came to think about this when my car developed a bad mood. It was difficult to get going at stop lights and such, but that was mostly cured by a new battery (so it seems). Tech said it wasn't getting enough power to ignite properly. If that has some truth in it, maybe the Monster alternator (generator?)/battery capasity is playing a part....

[Howie]

All of the above.  In the case of your car, the bad battery was probably affecting the ECU.

[stopintime]

All of the above.  In the case of your car, the bad battery was probably affecting the ECU.

Is there a stepper motor involved as well (in the car)? I can see how such a gizmo is affected by low current....

I can hear my shop's explanation to a bike stalling: "that's normal" 
My curiosity is directed at the milliseconds between idling and stalling.

[jim_0068]

Are you talking about the motor stalling on its own or stalling due to bad clutch control?

[stopintime]

Are you talking about the motor stalling on its own or stalling due to bad clutch control?

Mostly due to bad clutch control, I guess. It's only a theoretical question

[Howie]

The 1000 has a stepper motor, yours does not.  A bad battery can effect either ignition, fuel pump delivery, sensor inputs, any or all of the above.

Ummm...the US 800 does not have a stepper motor, I'm not sure about the Euro version.

[stopintime]

I was thinking about a stepper motor in my car, but as long as we're discussing it - could the 1000 surging issues be related?

(my EURO3 S2R800 vs US EURO2 S2R800 still doesn't have a stepper motor. Almost sure of it.)

I've been hearing that Ducs don't charge much below 3k revs. Can that (low voltage) affect smoothness and be contributing to rough idle and bad performance on low revs? I know that Ducs sacrifice low rev performance in order to run well on medium/higher revs - is it possible that this is made worse by poor electric performance?

[Howie]

Yes

I was thinking about a stepper motor in my car, but as long as we're discussing it - could the 1000 surging issues be related?

(my EURO3 S2R800 vs US EURO2 S2R800 still doesn't have a stepper motor. Almost sure of it.)

I've been hearing that Ducs don't charge much below 3k revs. Can that (low voltage) affect smoothness and be contributing to rough idle and bad performance on low revs? I know that Ducs sacrifice low rev performance in order to run well on medium/higher revs - is it possible that this is made worse by poor electric performance?

Surging on the SR1000 is mostly, IMO, caused by the O₂ sensor reacting slowly to running differences between the two cylinders, and, in the US, often aggravated by our ethanol laced gasoline.  Proper engine set up (throttle synch, CO balance, valve adjustment and valve timing) often eliminate or greatly reduce the symptoms. 

As far as the charging system goes, when alternator output is insufficient, if vehicle is fuel injected, the vehicle is dependent on a healthy battery to run properly.  This goes for both bikes and cars.  In theory, once the vehicle is running, the alternator should take care of your electrical needs.  This is often not true in reality.  Some of the folk on this board are old enough to remember when the addition of a more powerful headlight on your Brit bike would cause your bike to stall.

[jerryz]

ON earlier EFI equiped Ducatis the TPS slips over time and is a classic reason for stalling and poor low speed running

[ScottRNelson]

What actually happens / doesn't happen upon stalling a bike?

Fuel / air / spark - too much / too little

Every time I've stalled a bike (or a car for that matter), it's been due to too little RPM.

I suppose there have been a few times when it was due to too little fuel (i.e., running out of gas).

On a motorcycle I can always correct the problem with my right hand.