Cylinders 1&4 not firing

Posted by broot on Aug 04, 2012; 10:03pm
URL: http://vintage-and-classic-hondas.81.s1.nabble.com/Cylinders-1-4-not-firing-tp4026413.html

Hey folks. My brother's 1980 cb750k recently started dying when it was idling. Upon closer inspection it appears cylinders 1&4 aren't firing. After looking at the owner's manual we thought it may have been the ignition coil which connects to these two cylinders. Checked resistance across both primary and secondary and they seemed good (roughly 24 ohms on primary side and 13k on secondary). When we have the bike going we get no voltage on the secondary side of the suspect coil and a high voltage on the secondary of the good coil. The CDIs were recently replaced and when we swapped them around we still had hot 2&3 and ice cold 1&4. Is it possible the ignition coil is toast despite good resistance measurements? Could it be the pulse generator? Any help would be greatly appreciated!