I have a magneto question. I have a Victa Twin mower. These motors had problems with their ignition coils. esp. peculiar behaviour. Right now, I can get the motor to start, but only if I disconnect the front cylinder plug lead, fit another spark plug to that lead, then ground that plug on the mower base. It will then start immediately on the other cylinder and run well on only the one cylinder. If I can do it quickly enough, I can flick the 3rd plug off the lead at high revs sometimes and put it back on its proper engine plug, and it then continues to run correctly on both cylinders, but if I miss doing that quickly it stops. I have an Atom, twin electronic module fitted and it works ok on the other twin I have, so the problem is not with it. It must be some sort of coil problem, but what is likely to be i?