I'm sure Mr. Lush is everything you all with experience of him say he is
But honestly, this shouldn't require a specialist and let's respect Karl's choice to hold off on hauling his bike on a trailer he doesn't have.
At least for now, until further basic investigation is done.
Re the Injectors - It's a possibility but in my experience I've taken Triumphs that have sat for just as long and the injectors were not a problem
Especially if there was still gas in the tank (if that was bone dry & itself gummy however, probably different story)
But I do agree it's definitely worth taking a look at to validate or dismiss one way or other.
Again, fairly simple to test yourself Karl - just remove the rail & see if they spray when cranked
The nice thing about this type of fuel rail is that the injectors remain captive in the rail so easy to see how they operate.
If they're either dribbling when the rail is pressurized before even cranking, or you don't get a good even spray, then they will need to be serviced.
Just be careful - we are talking about spraying raw fuel here!
A few crank rotations should be plenty to see how they look. You will get a longer duration if you open the throttle.
And remember that if you DO have to remove them, your fuel rail may still be pressurized! So be cautious you don't get sprayed in the eye!!!!!!!!!!!!!
As suggested by BillB, if they do NOT in fact spray cleanly (or drip), then send them out to a professional injector cleaning facility.
Be sure to have new O-rings for permanent re-install.
p.s. If all three are poor, remember not to discount that you could possibly have low fuel pressure - that really should be checked also.If you can get hold of a pressure gauge, just stick it in that hose that fits onto the Fuel rail, turn on ignition and measure it while it primes. (you can also do just a crude check to see if you get good flow from that hose during a prime step - flow the fuel into a jar)