Cold start stall recent issue

[cbcanada]

Last month I had the electric wire to fuel pump fail issue.. I took out pump carved out the putty around the wires. Soldered back, refilled with jb weld.. While there inside the tank I changed the fuel filter too... Then I Put everything back and bike runs...no problem

But ever since then on a cold start and only on a cold start where the  bike has sat over night. When I start her. She runs for 2-3 seconds and stalls.. I restart and she jeeps running..

I can avoid it if I start and and give her gas very lightly for the first 5 seconds..

Does this make sense ? Why did this start to happen since I did the recent work?

[Howie]

The two problems are probably not related.  What year and model?  If it has a fast idle lever are you using it?

[cbcanada]

The two problems are probably not related.  What year and model?  If it has a fast idle lever are you using it?

2005 s2r 800

It does have a fast idle lever which I am not using but never had to use previously

However I forgot to mention while I had my gas tank off and was working on the fuel pump issue I did drill about 20 holes into the airbox to let some more air in

not sure if this could be affecting the situation?

[ducpainter]

Those 20 holes will definitely affect fueling.

Do you have aftermarket slip-ons?

[Howie]

I forgot to mention while I had my gas tank off and was working on the fuel pump issue I did drill about 20 holes into the airbox to let some more air in

That would be a problem.  As far as idle and start up a trim adjustment will work, but at speed you will be lean, even more so with aftermarket pipes.

[Speeddog]

Did you drill holes through the lid that holds the filter on, or through the box itself?

A pic or two of the holes would help.

[cbcanada]

Howie & ducpainter & speeddog

I have termi cans and recently put  straight pipes and took out the catalytic.. After that I got the ecu flash.. The holes are on the top cover of the filter. I did holes a month after the reflash.  I realize I should have put the holes prior to the ecu flash but I did not think it would affect that much

[ducpainter]

Depends on the map they used. Do you know? If they used a very rich map the holes might help. How did it run before you drilled the holes?

Like howie says the trim can be adjusted to richen up idle, and that might cure your stalling problem, or you can try the fast idle lever.

[Howie]

IMO, your next step is speak to whomever flashed your computer.  If it is a DP map you were too rich with the closed air box.  Better than that would be a dyno run.  The trim should be adjusted with an exhaust gas analyzer or you are just guessing.  Do keep in mind a little too rich will seem fine to the but dyno and too lean can lead to engine damage.

From your name I'm guessing you live in Canada?  According to your owner's manual below 10^oC (50^oF the fast idle should be used.

[cbcanada]

Ok when you said trim I thought you were referring to the lever beside the clutch.

Is this something different?

I beleive it was the Ducati performance ecu. The bike was running fine but had lost a lot of its low end torque due to no back pressure from the cat removal

So that's why I did the holes in the air box

[ducpainter]

Trim is adjusted electronically in the ecu.

Fast idle is the lever next to the clutch.

You can't add back pressure by increasing air flow at either end of the system.

My old Monster didn't lose any grunt from adding slip-ons or modifying the airbox. I think you have a map that isn't right.

[Speeddog]

I'd say tape over the holes and see what it does.

That's nearly a free experiment.

[cbcanada]

Trim is adjusted electronically in the ecu.

Fast idle is the lever next to the clutch.

You can't add back pressure by increasing air flow at either end of the system.

My old Monster didn't lose any grunt from adding slip-ons or modifying the airbox. I think you have a map that isn't right.

I was told when you open up the exhaust to free flow that you lose torque because you lose back pressure

[cbcanada]

I'd say tape over the holes and see what it does.

That's nearly a free experiment.

I am thinking same

[madalf71]

Hi CbCanada
My S2R800 2006 has all those mods, sans open and not drilled airbox.
A programmed Ultimap FIM ECU is fitted, no problems with fuelling, or low/mid torque.

I always use the fast idle lever from cold, it's very very rare that I don't.
The bike won't run on it's own until it's got a little warmth form a few mins of running.

Suggest you might have a tune issue.