Topic: only running on cyl 2-3

[000jeremy]

77 cb550f

Ive already replaced all plugs and gone through the carbs.  I know that only cylinders 1-4 are firing, but I dont know where to start going through the igintion or what/how to check?  I have a dyna-s btw

THanks in advance,
Jeremy

[dave500]

touch pipes 1/4 are they cold?pull all the plugs then see if 1/4 have any spark?if no spark try putting your thumb on the plug wire and see if it has a feeble kick,do all this with the tank off,check the wires are not disconnected or dirty connections for the coils,are they dyna coils?did a po fit the dyna?google the install instructions and check the basic settings for it.