Reply To: 1955 big twin – bottom plug fouling

[The red boat]

Thanks for the reply.

I have several pairs of spark plugs that have tested out ok. I tried swapping them around during my troubles but it didn’t make any difference – still no running on the bottom cylinder and immediately blackening/oily plug.

I have 2 new coils I just received in the mail. I will bench test them before using them. Before I install one for the lower cylinder I will do likewise with that coil mounted on the motor.

If all that checks out I may be going back to points and condensers (If I can remember where I stashed them).