JH600 stalling

[998S]

Although I guess that the fuel setting is probably not the only reason for the stalling issue, I highly wonder if replacing half of the engine is necessary.

Frankly that sounds very much as a TIC solution, not knowing the problem, and just starting to change parts, hoping sooner or later the problem will be fixed.
I suspect that the JH-manufacturer got it wrong on the exhaust gas regulations it has to fulfill for the Chinese approval, then set the injection too lean.


PS. An idle speed of 1700 is FAR to high for a 2 cylinder.
Even a high compression Ducati 2 cylinder runs perfectly at 1100-1200 rpm idle, and my Chang Jiang with a large flywheel ticks over at 800 rpm ....

Well, last night I re-read all posts, just to have a check on all problems and probable causes mentioned by all of you.
Also saw my above very first post, when I introduced myself, and the preliminary reasons I mentioned for the stalling issue.
As you know, first impressions are never far from the truth.

I went one by one through all the issues again, thought them over, and deleted them all as the cause.
The decompression was the hardest to crack, I can still argue that it might be related in certain circumstances, but I also deleted it as the cause for now.
That brought me back to the conclusion that it is mixture related.

And then all of a sudden I got a bright idea on how to temporarily override the ECU, tricking it into a richer mixture, and see.
I did that this morning, and it works.
The funny thing is that it does not only solves the stalling issue, but also gives more power in the mid range (or at least I think so, Milton will be the one to confirm that).
The other funny thing is that the bike runs at a much more realistic and smooth 1.500 rpm idle, which is right for a 1-cylinder.


I must be honest in that it will not be a 100% fix.
It is quite a "rude" override, which might have some other consequences (although the test ride this morning showed not much dis-advantages).
There still might be a stall every now and then, it probably starts more difficult, the fuel consumption might be up a bit, and the bike might be a bit surging on lower rpm's in higher gears.
However, with some fine tuning (I first let Milton use it for 1-2 weeks to see how things progress) we might even iron those issue out.

I need a bit of time to see how things are working out on the longer term, just to be sure I am on the right track.
Then perhaps do the same on Motokai's bike, to repeat the surgery and see if that patient also recovers better.
If that all works, and we still can't get into the Bosch ECU, then I can arrange an improved override for the rest of the bikes.

Eric