Thank you very much Hubert and Rick for your ideas and views. This is the kind of feedback I am looking for.

I do not have the Lambda connected right now, but I will soon (again).

Looking at the values of Hubert's map, I would say that I am in the ballpark, maybe max. +/-50% difference at some points or values. That's what is strange. How picky can this machine be? I mean, if the  map is anywhere near running state, why doesn't my bike even try to run?

Or does everything have to be spot on to get it running? I hope not. I do not have the time and nerves for that.

@Cliff:

One thing that comes to mind; how can I increase the spark with the CoilCharge -value (and also be sure not to fry the coils)? maybe if the spark isn't strong enough and due to the fact that compression is quite high, it's not starting. Just an idea...

At the end of the video I posted, where the bike starts, that is where the original ECU is used.


I am putting a new set of used coils to my bike today, to see if that cures the problem of running on one cylinder intermittently(with the original ECU). After this I can again concentrate on MyP8.

And during the weekend, I hope to get to a track again!

Hi Guys, I don't disagree with you Hubert but we a have a different way of doing things, and if they get the job done, that's fine by me. I think Marko needs to find what works for him.

For sure don't want to start a big discussion on this forum...

For me prime pulse is just one phase of starting as above 500rpm the ecu reverts back to the map so that why my opinion that you need good values on your idle positions so you know you have one problem and not multiple. That is  why I say is easier to sort your idle when the bike is hot and the start to work on your enrichment's over time. You know the bike runs and how much fuel it needs to idle.


Sorting the starts without knowing if the bike runs properly doesn't make sense to me but again different heads have different ways of seeing things...

I had a close look at the video the bike starts for a fraction and the dies. The reason the bike died in my opinion is not the prime pulse.

Actually in my view there are six parts of map that contribute to reliable starts and work on different parts of the starting procedure. You have to be methodical adjusting all these values.
The ones you say plus the 500 row,idle row, the after start enrichment and the permanent choke.
On my bike, I had to modify all this parts so bike doesn't die after 20 seconds...

Hubert, your procedure makes sense, but I've tried that and doesn't work for me.
If you think why you need a prime pulse in starting an engine, you will see your procedure may work on many occasions but not all...

When I tried something like you describe, I would get the bike to start, and think to myself, yes! nailed it, only to try to start the bike next day and fail!

The prime pulse need to be so big, first off all to compensate for any air in the fuel system, and because most of the fuel isn't burned when the intake and the valves are cold. These parts are cold and the fuel forms droplets that doesn't mix with air so to compensate this...

Thanks again for both of you for your posts.

About the injectors; they are IW724 and flow according to data found on the net is somewhere in the region of 300cc/min. Pressure in the fuel system is if I remember correctly, 3bar. (or was it 3,5 bar?)

About the ECU itself; Yes, I had some soldering errors on it, but they are fixed and I hope that's the end of that. Everything is possible of course..

The reason for me trying to start this bike cold is that basically you can do it only once a day (to test the cold starting features). then you have to wait a long time before everything is cool again.

I understand the two ways of methods offered her to tackle my problems and in a way, both are right.

Maybe I should get it idling perfectly when warm and then try to do the same when cold.

I will definitely report back here when ever I do something and report any logs videos and findings..
If I would be doing all this on my own, I would have given up long time ago..

My history with this bike starts in september 2005, when I bought it from Germany with 19000 km on it. it now has almost 65000 km on it.

I have had so many mechanical and electrical problems with this bike during the past 8 years that a person with a shorter fuse would have sold/dismembered the bike LOOONG time ago.

unfortunaltey my old blog dissappeared in to byte-heaven.. there I had reported all sorts of findings and such along the way.

every time I thought I figured out some problem and got it fixed, another problem popped up. Now the latest is this running on one cylinder. It has done it many years, but usually only 1-2 times a summer and always a very short time, max 30 sec. now last saturday, it happened again and I had to ride 50 km's, more than 30 minutes on/off/on/off with 1/2 cylinders.. frustrating to say the least.

now I am off to put the new coils to it and tomorrow I will test ride.

Thanks all..

Nothing much to report, other than I almost burned my bike on friday while test riding with the new coils.. Had a split in the fuel line above the rear cylinder. 

Sunday I was on a race track. Perfect weather.

I hope to get back to MyP8 testing this week.

The early versions of the MyP8 had the capability to  drive coils directly but as the feature was never used I removed it.

This lack of spark is on a running engine or you're not seeing spark while trying to start the bike?

Before you start swapping all those expensive parts one after the other you could try to add some extra cables in parallel to the existing harness. Maybe it's just a problem with the cables or - even worse - with the connectors.

Hubert

If you wanted to do away with the modules altogether it wouldn't be a big job to add add a couple of FETs inside the ECU to do the job. ( and rewire the modules out )
You'd want to be sure you've identified the problem first.

I am not sure if it is the rear cylinder every time that is acting up. there is no way of checking it while riding.
Long time ago, when this happened, I had just started the bike and I was at a petrol station, I could feel the exhaust and that was when I knew it was the rear cylinder.

I have found another alternative for the marelli ignition module. I will test it and if it works, I will get also another and be done with it. It was 21 EUR.