Tony Outboard
Contributing Member
Hi All,
I'm hoping an electrical guru on here can give me a few ponters.
Purchased the above engine a while back as a non-runner project to re-build, it was quite ropey and the original problem the previous owner had was that it would run for about 20 minutes then cut out and not restart.
To cut a long story short, mechanically it's now a beauty, re-built her, all electrical components removed, mating faces clean as a whistle, tested the spark post re-build, it was a strong blue spark that easily jumped 1/4"
Put her in the tank, ran her up, started and run just fine, after about 20 mins, right enough, dead cut, tested the ignition and there was no spark.
That was a few days ago so there's nothing related to an electrical component overheating.
I've been troublshooting (resistance only, waiting for a DVA adapter to arrive) and found the following
Capacitor charging coil - Bad 61.1 Ohms - Manual calls out 93-142
Trigger coil - Good 92.5 Ohms, Manual calls out 80-115
Primary coil - Good 0.4 Ohms, Manual calls out 0.02-0.38 but I should think 0.4 is close enough
Secondary coil - Bad 5.6 K Ohms, Manual calls out 3-4.4 K
So the questions are, can anyone give any reason the engine would be fine and produce a spark after sat there for a year or so and then just have a total spark failure ?
Given that the Charge coil and secondary windings are both out of limits, do I need to go out and buy both before I proceed any further with troubleshooting or are there any further test I can carry out on those components.
Many Thanks. Tony
I'm hoping an electrical guru on here can give me a few ponters.
Purchased the above engine a while back as a non-runner project to re-build, it was quite ropey and the original problem the previous owner had was that it would run for about 20 minutes then cut out and not restart.
To cut a long story short, mechanically it's now a beauty, re-built her, all electrical components removed, mating faces clean as a whistle, tested the spark post re-build, it was a strong blue spark that easily jumped 1/4"
Put her in the tank, ran her up, started and run just fine, after about 20 mins, right enough, dead cut, tested the ignition and there was no spark.
That was a few days ago so there's nothing related to an electrical component overheating.
I've been troublshooting (resistance only, waiting for a DVA adapter to arrive) and found the following
Capacitor charging coil - Bad 61.1 Ohms - Manual calls out 93-142
Trigger coil - Good 92.5 Ohms, Manual calls out 80-115
Primary coil - Good 0.4 Ohms, Manual calls out 0.02-0.38 but I should think 0.4 is close enough
Secondary coil - Bad 5.6 K Ohms, Manual calls out 3-4.4 K
So the questions are, can anyone give any reason the engine would be fine and produce a spark after sat there for a year or so and then just have a total spark failure ?
Given that the Charge coil and secondary windings are both out of limits, do I need to go out and buy both before I proceed any further with troubleshooting or are there any further test I can carry out on those components.
Many Thanks. Tony