Lets try dubug this by substitution:-
1) Comfim its no 1 and no other cyls are misfiring as well
Feel the exausts after 10 seconds on running from cold, be quick though the heat bleads through to the outer pipe quick. What your looking for is no 1 should be cold/colder than the rest.If its cold a new plug is a good idea. Repeat the same proceedure. Still cold the fire easy start up the carb or remove the plug and put in 10 drops of fuel. Try again. If the engine now fires it points to fuel problem.
2) Check fuel to carbs ( I trust its not over 6 months old, it goes off bad now ).
Pull off petrol pipes from the tap, switch on tap does fuel flow? if not clean tap bowel out , if the petrol does flow ok and your bike fails on 1 after some miles the filller vent could be blocked ( ride with cap open to check this one out).
With fuel flowing to the carbs flip the float bowel off is it as full as the other carbs, no well sort that out, could be stuck needle valve or blocked passage way in carb.
3) Still no luck? Now it gets tricky, you see the spark could be there but too weak. Or its a mechanical problem. I trust valve clearances are O.K (mabye check the on cyl 1).
4) So it could be condensor or coils (most likley coils) you can check this out by swapping the condensors over/fitting another one.
5) Still no joy O.K now swap the yellow and blue connectors over that go to the coils and swap over the positions of coresponding the h.t leads. In other words swap 1 coil into the another coils position ( you may need to remove the coil set from the frame but make a good wire connection from the coil alloy bracket to the frame. Now the fault should move to another cylinder. However if your coils are 5 to 10 years old they will be one there way out anyway in my experiance so get a new set from David Silver Spares at £55. And save some time.
6) But before you spend the £55 pos do a compression check if you suspect over revvinging or the engines been standing for some time.
Graham
