Quote Originally Posted by ZMC888 View Post
Seems highly plausible. Wouldn't a friendly chat with a Jialing engineer with a new efi map be a likely solution?
As said, I don't have the slightest idea of the JH-600 injection set-up, need to see it in person to come to conclusions.

However, on most injection systems, there is a small idle bypass valve, which can be turned in or out.
The basic function is to get the CO and rpm's right at idle, but you can play with it a bit.

There should further be an adjustment for the overall fuel-trim, either electronically or "old style" potential meter (in the ECU unit).
This one controls the fuel-trim on top of all map-settings.
If it is old style, you can also play with it (if you know what you are doing though).

But I presume it is already completely electronically controlled.
Then you need to connect the bike to the diagnostic system, and see what to change based upon the readings (the first one is easy, the second part is the problem I think, as I have met no engineer here yet who really knows what he is doing with the info from the system).

If someone in Shanghai is willing to show me his bike, I can have a look at the system as a beginning.
If not too many surprises (and I think the injection is pretty basic), I might advise you some next steps.

Eric

PS. I enclose a picture of the basic set-up on a Ducati:
Volt meter to calibrate the ignition pick-up sensor
Vacuum gauges to balance the cylinders (not necessary for a 1-cylinder)
Diagnostic software for control and setting
CO-measure equipment to set the CO at idle (and balance the CO between the cylinders if multi-cylinder)

DSC05736.jpg