[EDIT]
Sorry for late update. Work.
The exhaust is not leaking.
Since my visit to Denver I took the injector to a local outfit (Diesel Forward) for a "Clean Flow, and Advise", and here's the report, as written:
"Unit for repair/1 gas injector/Customer states clean and flow injector/Flow injector found decent spray pattern/Clean injector and re-flow/Found spray pattern improved and fuel delivery increased approximately 1cc/"
I wondered a bit about the "increased appproximately 1cc" after the business had said that he initially measured a volume of 76cc, and after cleaning in an ultrasonic tub saw an increase to 86cc. A typo in the report (should have read 10cc)?
So the only thing I have to go on is the injector has continuity through the pins, the solonoid works when power applied, and the flow check was good per the technician.
One would think that would settle the issue, but a mechanic I know and have trusted over the years asked about the results and says that still doesn't mean the injector is good to go, and the only way to be certain is pop in a new one to compare. OK, at anywhere from $65 to $150 either I have to shell out $$$ to get one fast, or wait forever to get one from India.
Installed the injector yesterday and took her for a run. Same issue, and seemed slightly more sluggish at lower speeds and gears. Still stutters at WOT, and I still can't get over 50mph indicated as if the sidecar was still attached.
I'll hold off until I can properly check the TPS. That said, I've been looking through the Service Manual for info on the TPS but can't seem to locate anything. Then I found singhg5's video in my library. Will check the TPS and temp sensors as soon as I can. Hopefully today.
The bike has been returned to the same condition as it was prior to adding the sidecar, EJK removed, and O2 sensor re-installed.
I have not done a proper compression check yet, since that would require removal of the auto decomp, but if necessary I'll do it.