Cannondaleriders

How many spare parts do you have? at this point you could replace everything electrical, harness, sensors, coil, ECU, flywheel, stator, pickup coil, TPS and circuit on the throttle body, you already did the injectors right? if that cures it at least you know it was electrical and not something mechanical. after that start changing out with your old componants until you find what the problem was.

I don't have that many spare parts left to try
The last time it shot flames out of the exhaust like this, I cracked an early style piston sleeve, but that was easy to diagnose due to the amount of coolant comming out of the exhaust.

Do a compression test already.

Right, swapped a load of parts round, stator, flywheel, and it's no better no worse.

I don't have a compresion testing kit at my disposal, but I'll get one as they don't seem to be particularly expensive. Is there anything I need to look out for with a compresion testing kit?

Interesting. I was just fidling about with some wiring under the ecu tray and the ignition died before comming back on and priming the fuel pump. Bit more fiddling, and the same thing. I haven't done a full investigation as it's a bit tricky to get under the front end, but I'll have another go tomorrow.....

sounds like you may have just found the problem
not all compression testers will fit down into the head, that is about all you need to watch for.

I hope so.....

Fif you see thid threag?
CPS was the issue

Now that is interesting. I just assumed that because the bike was running even with the issues at low revs, the CPS must be working too. I have a spare so it'd be dumb not to try it.

Going to have a proper look at those wires this weekend as well, because I'd hat to pull it apart and still find it was running snotty.

I'm fairly certain that stator is knackered. Those wires around the outside have been skimmed flat.