The stator is the large set of windings mounted on the lower left side of your engine primarily under the magnetic dome shaped rotor......
It contains both the alternator windings (to recharge the battery), and the ignition pick-up coil (exterior to rotor) and advance coil (within rotor) that trigger and control ignition timing........
Failures to rev past 4K are often due to the advance coil/winding failure...This is not a separate part and the stator is replaced as a complete unit......
The stator can be tested by verifying the Ohm readings are within the specific ranges listed in the factory service manual.......
Jim, (longdistancerider) has provided a good discussion topic detailing this procedure, and it can be found in the SOHC electrical section.....
Ignition Switch Off = Infinity
Ignition Switch On, Kill Switch Off = -123
I'm not sure if I was just having issues getting the probes on there properly for those two or what, but it seems like since everything else was in then maybe the CDI might be my issue after all.
1982 CB450SC - first bike
So the bike engine will not rev past 4 to 5 k revs and it seems like a fuel issue, or a ht coil breaking down..........you have used the red neon plug caps so you can "see" the spark ( the red neons flash as they pass ht to the plug ) or spark loss.
The engine seems to surge at about 4 to 5 k revs and slows down a bit then re revs etc.etc.etc.
Have you check for proper ignition advance?
Have you checked acv outputs of the genny ign system wires?? as a rule all acv values should rise with increase in engine revs, rate of change.
disconnecting the cdi black/white wire will disconnect the cdi from the rest of the bike. earthing this cdi black/white wire kills the ign. Sometimes the handlebar dedicated kill switch can cause problems, especially when wet.
cdi's have been know to "die over night" which has happened to my sons 400, then a few months later the genny stator died.........
a multimeter will show acv and a pulse to the ht coil, but a scope will show much much more.....
you have a wiring diagram and know that the genny ign windings are on the same stator as the charging system coils but are completely seperate........the reg/rec is the black finned unit by the fuses........3 yellow, a black and a red/whiter from memory.......
Last edited by drydreamer; 09-11-2019 at 04:08 AM.
Before replacing a CDI it's useful to use a timing light and check the advance. It sounds like you're not getting any which is controlled between the stator and CDI.
1979 CM400T "road bike" modified for travelling
1978 CB400T1 restored
1972 CL350 nuts and bolts restore in progress
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I checked the timing and it's on 'F' on start up. When I twist the throttle it moves towards the 'II' mark.
Do the marks need to be perfectly on the index mark? The 'F' appears to be a bit ahead of it on idle, and the 'II' seems like it struggles a bit to get to the index but it does get there. That's the point when it hits 4000RPM and won't go any further.
Last edited by jgordonoglan; 09-14-2019 at 02:21 PM.
1982 CB450SC - first bike
Last edited by 66Sprint; 09-14-2019 at 02:24 PM.
Now the question becomes what is your idle RPM?....
AND YES, EXACTLY on the F mark alignment......
Sounds like you are starting out partially advanced at idle, and thus it can't fully advance the necessary number of degrees beyond that initial setting......
Have you checked for a damaged (crank to rotor) key or key-way?
(Which would shift advance timing slightly. making it difficult to smoothly increase in RPM, with incomplete fully advanced position causing the peak RPM limit/stoppage )
While the rotor is off to check that, look at the advance pickup coil to check for overheating as a short there would "read" erroneously to the CDI...(Although your prior Ohms readings SHOULD have told that tale......)
Last edited by 66Sprint; 09-14-2019 at 02:46 PM.