Hello I’m posting for help, I have a couple of questions and I am hoping someone might help me out due to not having a repair manual available. fzr 250 3LN1 What voltage do you get from the 2 pins at the plug for the ignition pick up sensor when cranking? The ignition coils- what colour plug runs which coils yellow plug and white plug should run which coil? can someone have a look on a known running bike at these 2 questions? Thank you
Yellow plug for coil firing cylinders #1 and #4 White plug for coil firing cylinders #2 and #3 Coil wires have + and - to coils pink to + and black to - Correct configuration to plugs https://2fiftycc.com/index.php?thre...eads-spark-plug-configuration-inline-4s.8176/
Brilliant thank you very much for that, I appreciate it. You dont happen to know the voltage I should be getting on cranking at the ingintion pick up do you?
Answer is mu (none, not related). When trigger bumps move past pick-up sensor, it generates tiny AC with positive and negative wave. You'll see something like this on oscilloscope: put many of them together and you see something like this: There is missing tooth that tells ECU where TDC is occurring. Test for pick-up coil sensor is to measure its resistance (at room-temperature STP). Then compare to value given in manual.
Also measure peak-to-peak voltage on waveforms and compare to what's listed in manual. In many cases, pick-up coils loosen with vibration and drift away from triggers, lowering signal. Adjust them to 0.25-0.40mm away from trigger teeth. Use some thread-locking compound on fixing bolt. Next test is to measure power going to ignition coils. Slide connectors 1/2-way off primary of each coil so you can measure voltage without disconnecting: Key ON, start/run swith ON 1. voltage at coil-1 power = ??? 2. voltage at coil-1 trigger = ??? 3. voltage at coil-2 power = ??? 4. voltage at coil-2 trigger = ???
Next, test for coil-triggering signal from ECU/igniter to coils. These are grounding pulses to dump field at coils. Again, not DC that can be measure with voltmeter. Looks like this on oscilloscope: Notice grounding pulses are extremely short, ~5ms or less. Without oscilloscope, you can use 'noid light to test. These have duration-extending circuitry to lengthen ON time of light long enough so that human eyes can see it. Connect with test-leads to each terminal if coil primary. Amazon - noid light
