devoncote98
CB750 New member
I picked up a CB750K1 that has not run in at least 18 years. After performing preliminary checks and maintenance (changed oil and checked other important things) I replaced the ignition coils because I was informed that they had gone bad before it was put in storage. Time to start! Right?... Nope. I cranked it over with the starter, to find out, no spark.
The tests and adjustments that I have performed:
-Gapped the contact breaker points
-Cleaned spark plugs
-Checked for continuity in wires-- No broken wires
-Tested condensers-- good
Information found:
-very little power to left point/ no power to right point
-no continuity through silicon rectifier bridge.
-Cylinder 1+4 coil warms up when key on
-Cylinder 2+3 coil does not warm up
At this point, I am convinced that the rectifier is the problem, I have tested the rectifier in both directions to eliminated the possibility that the diode is tainting readings.
I need help, the ignition system is my last step to making the engine run.
The tests and adjustments that I have performed:
-Gapped the contact breaker points
-Cleaned spark plugs
-Checked for continuity in wires-- No broken wires
-Tested condensers-- good
Information found:
-very little power to left point/ no power to right point
-no continuity through silicon rectifier bridge.
-Cylinder 1+4 coil warms up when key on
-Cylinder 2+3 coil does not warm up
At this point, I am convinced that the rectifier is the problem, I have tested the rectifier in both directions to eliminated the possibility that the diode is tainting readings.
I need help, the ignition system is my last step to making the engine run.