my trophy will not start, there is on spark comming from the plugs i have had the coils and Igniter checked both OK, i have only had the bike for a few mounths, when this first happend i changed the plugs and found that from (left to right) No1and2 plugs were normal condition but 3and4 were like new no ware on the plugs, i change the plugs but now she will not spark at all, can some one help thanks fred