JH600 stalling

[998S]

So, last night Fan sussed out that it's most likely one bad wire coming from the Fuel Pump Relay (Good on you Milton!). So now he has the ECU harness out from another bike and he's working thru to find the source of the issue and which wire. Hopefully today I'll hear more.

Let them indeed try to dig deep.
Relais can fail, for sure, but for me it sounds a bit suspicious that after the upgrades you all get these problems.
Think back on your starting issues before the relais failed, could be very easiliy fuel starvation; sounds logical.
But why?

[milton]

Pins are different, so you can't just replace it!
Why not a Bosch relay then? Matches the ECU

Jialing uses Chsky brand, not sure if there is a genuine Bosch part available. The guy who posted it probably couldn't source the stock part.

[Barry]

You'll find some cheap relays of 1 kuai on taobao and I found some Bosch relays of 40-50 kuai. And even though those Bosch ones are not the right ones for our bikes, you'll get the point of keep costs low. 5 relays can cost 5 kuai or 200 kuai! No idea how many relays an average bike has, anyone?

[MotoKai]

Well you'll need a relay for your Starter, for your Fuel Pump and for your LED Flasher/Blinkers for your Turn Signals.

[milton]

But why?

This has nothing to do with your post. Just like you to know that I like your previous generations of avatar whole lot better.

[euphonius]

Let them indeed try to dig deep.
Relais can fail, for sure, but for me it sounds a bit suspicious that after the upgrades you all get these problems.
Think back on your starting issues before the relais failed, could be very easiliy fuel starvation; sounds logical.
But why?

As noted in a previous post, Motokai's bike was exhibiting a peculiar behavior after Xiao Bao swapped out Motokai's new ECU for mine, which is also new and unused. When he switched on the electrical system by turning the key, the fuel pump did NOT spring to life as it should, yet the starter motor would indeed spin the engine when he thumbed the ignition switch. So this was clearly a "fuel pump not delivering" problem, which would be caused by only a couple of things: a bad fuel pump, or lack of current to spin it, which could have been caused by a bad wire or connection, or a bad relay. Happily, the fault was not with the ECU. All that Motokai swapped in the 3.0 "upgrade" was the ECU and the very complex wiring harness, which presumably came from Jialing, but perhaps came from elsewhere. Here's what it looks like:



With this in mind, I'm keen to hear the results of Xiao Fan's investigations. Hopefully it's just a bad wire or or bad relay, both of which should be relatively easy to isolate and repair or replace. Next to eliminate would be the fuel pump.

After that, next steps would be the new Denso spark plug and the spark plug cable.

Next I'd be thinking about the power generation system, particularly the stator that Motokai had to replace last year during his ride through Bashang north of Beijing (for those of you who were not distracted by some of the pictures in that elegant thread). But we are getting ahead of ourselves.

Armchair wrenching! Gotta love it!



Cheers

[MotoKai]

Thanks Euphonius.

And for those who are a bit "shocked" by the photo of his chair, you'll be happy to know that it matches most of his other furniture.
This one from his living room:


Question: How many relays does your chair have?

[euphonius]

Then there's the bedroom.

[Barry]

Don't forget the playroom!

[998S]

So this was clearly a "fuel pump not delivering" problem, which would be caused by only a couple of things: a bad fuel pump, or lack of current to spin it, which could have been caused by a bad wire or connection, or a bad relay.

If that the case I am fine with it. What I however tried to express is that there might be a "deeper" cause for this.
Why are several Jialings having starting problems some time after the upgrade?
I do not believe that they all have all of a sudden a bad relay.
And if they have, that must have a reason, like a spike in voltage or so.

Just my 2 cents ...