Trying to help my mate out with his SR400. The ignition has died and by testing the coil, pick ups and relays they all show correct readings. This leads me to believe that the TCI box is faulty but am having trouble finding a reasonably priced replacement. Yamaha want $700 for a new one. Second hand from Japan are around $350+, so am asking the brains trust 'do you have any suggestions that won't cost more than the bike is worth'? The bike is 1992 model 3GW with a Denso 070000-2540 unit. Thanks.