"About six months ago I "
"About six months ago I "shotgunned" an intermittent no start/no spark BF8A by replacing the cdi unit and ignition coil. The complaint was that after running and shutting down, the motor would not re-start. This motor is back - and after running for about five minutes, it stalled and would not re-start. A spark tester showed no spark - even after several hours of cool down. The neutral switch tests ok. The kill switch tests ok. The cdi charge coil tests at 268 ohms and shows a clipped, or rectified ac signal peaking at +54 volts cranking. The cam sensor (or pulser coil) tests at 126 ohms and scopes a consistent ac signal +1 volt to -1 volt during cranking. The still fairly new ignition coil primary is .57 ohms and secondary is 26.5 k-ohms. The cdi unit will rarely deliver any substantial signal to the ignition coil primary.
Replacing the cdi unit (again) brought instant, but short lived results. After running for five minutes - dead...no spark.
The seloc on-line manual that I bought is no more useful than an owners manual. NO comprehensive specs for the cdi charging coil and no test procedure for the cdi unit. Also, no technical description of the cdi module logic with regard to the oil light circuit. i.e. if the light is burned out, will the motor start; and if so, for how long? I could see that if the neutral switch is opened or the kill switch closed, cdi charge voltage is zero while cranking.
Does anybody know what kind of waveforms & data are to be expected from the charge coil and pulser coil? Any ideas on what could be killing the cdi output to the ignition primary? Could there be a mismatched ignition coil? I have part numbers, serial number and can forward a snapshot of coil waveforms."
"About six months ago I "shotgunned" an intermittent no start/no spark BF8A by replacing the cdi unit and ignition coil. The complaint was that after running and shutting down, the motor would not re-start. This motor is back - and after running for about five minutes, it stalled and would not re-start. A spark tester showed no spark - even after several hours of cool down. The neutral switch tests ok. The kill switch tests ok. The cdi charge coil tests at 268 ohms and shows a clipped, or rectified ac signal peaking at +54 volts cranking. The cam sensor (or pulser coil) tests at 126 ohms and scopes a consistent ac signal +1 volt to -1 volt during cranking. The still fairly new ignition coil primary is .57 ohms and secondary is 26.5 k-ohms. The cdi unit will rarely deliver any substantial signal to the ignition coil primary.
Replacing the cdi unit (again) brought instant, but short lived results. After running for five minutes - dead...no spark.
The seloc on-line manual that I bought is no more useful than an owners manual. NO comprehensive specs for the cdi charging coil and no test procedure for the cdi unit. Also, no technical description of the cdi module logic with regard to the oil light circuit. i.e. if the light is burned out, will the motor start; and if so, for how long? I could see that if the neutral switch is opened or the kill switch closed, cdi charge voltage is zero while cranking.
Does anybody know what kind of waveforms & data are to be expected from the charge coil and pulser coil? Any ideas on what could be killing the cdi output to the ignition primary? Could there be a mismatched ignition coil? I have part numbers, serial number and can forward a snapshot of coil waveforms."