Re: Pointy not firing on rear.
 

Can you un-abbreviate please? What does LT stand for? Low tension?

Re: Pointy not firing on rear.
 

http://en.wikipedia.org/wiki/Low_tension_coil

and

http://www.old-engine.com/maglco.htm

Re: Pointy not firing on rear.
 

Yes. Have you checked the voltage at the coil LT? One of the thin wires on the coil will be constantly live while the engine is set to run.
Put a voltmeter set to 20ish VDC between the LT wires and the battery negative terminal, there should be one wire at each coil, (on a Suzuki typically the one that's orange, or with orange in it, your bike may differ but it doesn't matter), that has battery voltage when the ignition is on.

Have you done this yet?

Re: Pointy not firing on rear.
 

I need to get a voltmeter first, and for that, I need a bike that can take me to Halfords! I will get there soon. I think a ~3 hour walk may be due tomorrow..

Re: Pointy not firing on rear.
 

Turns out that after checking the ECU and voltage from battery, it was all good, so we (spanner_man and I) presumed that there was a bad connection somewhere in the loom. As a last-pitch effort, we replaced the concerned ignition coil (which you must recall, DID work, making sparks when attached to the other coil's wiring) with a new one, and everything worked!

So, despite the coil worked when attached to the front cylinder's ignition wiring, it was still broken! I rode away with no problems using the new coil.

Can anyone explain this?