What fault code comes up ?

The bike will run fine for a short ride. The motor will run lean so just do a short ride to confirm if it fixes the problem is with the bike.

 Well James, I wonder if it could be as simple as the TSS/TSM sensing that the machine is past it's lean angle, or has exceeded the climb angle and is shutting the engine down below 2000 RPM or over 4000 RPM ?

Maybe the G force of excelarration during the scenario you describe is triggering the unit if it's mounted a little un-level, or water has affected it?

Now I seem to remember that when a TSS/TSM shuts down an engine, it kills it just like the kill switch has been flicked, no ign or fuel.

And all that is required to get under way again is to reset the ignition,,, and there are no codes come up.  

Not sure of all the parameters involved in safety shutdown, but wouldn't surprise me if a rev range was in there somewhere.

Good luck in cracking it Mate, If I find anything around the other forums /sites I'll let you know.

 Well lets hope you find the cause. And I reckon it will be one tricky little barsteward that is more than likely to do with that wash you gave it.

(considering that all was OK before this event, there has to be more than a good chance that it may have been the cause)

I guess that you've tried Googling the fault, www.google.com.au/webhp

I had a bit of a look and came up with a similer thread on the 1340 forum, even thogh not exactly the same, there was one reply that is really interesting, have a look at the eighth reply to this thread, www.1130cc.com/forums/showthread.php  by FatbyRR.

All the best James, hope you snag the cause early in the process of elimination.

The throttle position sensor could be giving you the problem as well. Its located in the top of the throttle body next to the IAC. The IAC controls the idle circuit but I doubt thats giving you the problem.

Interesting, that being the case, it could be anything from a dicky battery terminal to a crook voltage regulator .

Or stator/rotor that is playing up at that magic RPM. 

Check the throttle blade (butterfly) shaft is not broken as the early Delphi throttle body had a habit of snapping the shafts.That would fuck up the TPS readings.

 Hmmm, then that should eliminate any thoughts about software corruption, which just leaves firmware or hardware issue with the Tmax.

The PC V and Original ECM will tell.

Again, good hunting.

I'm thinking that flicking the kill switch is simply doing what turning the Ign switch off/on does, it's cutting power to the ECM then re-supplying power causing a re-boot on the fly.

Same result, just using a different switch.

Chances are that cycling the ign switch while the fault is present, and during decel, you get the same result ???

Soon or a later you're gunna see the gremlins tail dissappear around the corner and that'll lead ya closer to his den !

Edit;

and thinking aloud, either way, it appears that cutting power resets what's causing this fault to instantly clear, so, the gremlin is something that is subject to either reset or reboot. 

 Yes, I see what you mean, if it takes 30sec/30sec for the TMax to reset, then the kill switch test shouldn't reset it.

Well, assuming that it's firmware and software is OK ,(specially after the re-install) , then you could eliminate the TMax as the cause and continue looking for something that resets instantly.

It's a tricky little bugger as the ECM must think that it's working OK, as it isn't throwing any fault codes.

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Depending upon your lappy, most should allow you to go into the control panel and change the power settings so that closing the lid doesn't put the CPU to sleep. Then it's just a matter of patching in and carrying the lappy in a shoulder bag or such.

 Well it's good to hear that the decel shutdown problem has gone, and in time the DTC may follow,,,

This one has been a proper little poltergiest, lets hope you don't get visited by him/her again.

It does sound like moisture after the wash was more than likely the instigator.

Just made me think of things I used to do to prevent moisture problems.

After cleaning and treating with dilectric grease, a coating of clear laquer over the connections made me feel like they were waterproofed,

well at least didn't experience any wet's after doing that.

Had a look around but good you fixed it but i came across this if your interested;

The bank angle sensor is an 8-pin accelerometer integrated circuit inside the TSM/TSSM, not a mechanical or mercury switch. It outputs an analog voltage (0 to 5 volts) depending on the direction and angle of lean. I've modified mine to disable the sensor because it kills the engine when turning hard (racing) with a sidecar. This photo shows the TSM, and part of the mod I did.

http://www.hogwildracing.com/technical/TSM_Board_Top_cut_pin_7.jpg

Good one, that's gotta make ya feel a whole lot more confident about getting out and about,,, and just as well as ya have replaced that mongrel circuit breaker before it fell apart while you were on the road.