Don't feel too bad; my bike decided to run on one cylinder right after I replaced the rear tire...no warning before hand. I parked it and took off the rear wheel and when I got the new tire on it would only run on the left cylinder. I spent a week trying everything I could think of. Turned out to be the igniter but without a known good one to use as a test I just bit the bullet and bought a used unit from Pinwall Cycles eBay site at less than half of the dealer cost. Good folks at Pinwall and the igniter is still working.
