rodsurbina
CB750 New member
Hi there. New here and very excited to get my CB back up and running! I have a ‘81 CB750F, all original excluding aftermarket exhaust (4 into 1).
Before any work, it ran...not amazing...but it ran. Carbs needed to be cleaned, boots were cracked and were leaking air badly, exhaust was all dented up underneath.
I rebuilt the carbs, replaced the boots, replaced the exhaust with the same model (4 into 1), replaced the regulator rectifier with a Ricks model, and popped in a new battery. Went to start....only got cylinders 2 & 3 to fire.
Replaced all spark plugs, wires, and both ignition coils. Same issue. Followed the ignition coil harness to the spark units/CDI boxes. They looked ok but I switched them to hopefully get spark on the outer cylinders. No luck, same issue. Getting spark out of one coil (cylinders 2 & 3) but nothing out of the other (cylinders 1 & 4).
I’m at a loss and I’ve come for guidance! Can anyone point me in the right direction?
Thanks in advance!
Before any work, it ran...not amazing...but it ran. Carbs needed to be cleaned, boots were cracked and were leaking air badly, exhaust was all dented up underneath.
I rebuilt the carbs, replaced the boots, replaced the exhaust with the same model (4 into 1), replaced the regulator rectifier with a Ricks model, and popped in a new battery. Went to start....only got cylinders 2 & 3 to fire.
Replaced all spark plugs, wires, and both ignition coils. Same issue. Followed the ignition coil harness to the spark units/CDI boxes. They looked ok but I switched them to hopefully get spark on the outer cylinders. No luck, same issue. Getting spark out of one coil (cylinders 2 & 3) but nothing out of the other (cylinders 1 & 4).
I’m at a loss and I’ve come for guidance! Can anyone point me in the right direction?
Thanks in advance!