Hi
Whilst checking over the electrics on my 1989 2ma I have measured the resistance of the pickup coil to be 230 ohms (ambient temperature around 25 degrees). The manual states it should be between 94 - 140 ohms at 20 degrees C.
The bike seems to start and run fine so I was wondering if this extra resistance actually makes any difference or could lead to damage to other components such as the CDI? Hopefully someone with a better understanding of electronics can explain.
Thanks!
The pickup for the ignition is part of the triggering circuit.
The dc resistance measured is a guide as the important factor will be the inductive reactance of the pickup coil which can't be measured with your average multimeter. (Not being an expert on this by the way)
This accounts for the resistance range given.
Your value measured suggests maybe a different pickup has been installed? There are quite a few available from Electrexworld that will do the job.
But to answer your question, its quite possible that this pickup will work indefinitely, providing it isnt faulty.
Did you measure it from the soldered terminals on the pickup with the pick up disconnected at the CDI ? if not you will get a false reading.
Also measure to earth from each side of the pickup as this should be zero. Bear in mind that some twin pick up models have one side commonly wired together. Your wiring diagram may show this.
if you still have this high reading (compare across both coils for a twin - if you have them) but no reading to earth you should be ok. This indicates more windings or finer wire used on the pickup which will drive the ignition trigger circuit a bit harder. We are talking mA here or less so it shouldn't be a problem for a robust CDI.
If the measurement at the pickup is ok but high when measured at the CDI plug you may have a bad connection, but check you are not measuring across the wrong wires as you may be reading across the 2 coils in series which would give the readings you report.
Hope this makes sense ?