What causes a weak spark on a motorcycle?
Weak spark occurs when the primary side of the ignition coil short circuits within the coil windings.. (Less coil windings to flow through generates a lower voltage spark (Weak Spark) And to test the coil , you need to know the primary and secondary resistance values to determine if it’s farked..
Why are there no spark plugs on my magnetos?
These faults do not necessarily occur instantaneously, they may develop over time leading to a gradual deterioration of the spark output. The voltage generated across magneto coils is quite high, in the order of 20,000 volt if no spark plugs are in place. The coils are, of course, designed for this pressure but no insulation is perfect.
What causes a no spark condition open loop?
If after unplugging the 4-plug connector there is no spark or the spark still looks weak, this tells you that the problem is in the major ignition components like the stator, coils, cdi, spark plugs, spark plug wires, possibly a short in the wiring harness, a bad trigger coil or on EFI models your Injector Coils are bad (they measure 19-20ohms).
What are the issues with a no spark motor?
Other issues related to a no spark/Weak Spark/Wet Plugs issue: Wrong flywheel on it. Sled was only running on one cylinder. Low side coil on his stator read 360 ohms and it should have measured 450 ohms. The low side coil was bad. It kept fouling plugs left and right. The guy before ran ethanol, and never told the current owner.
Weak spark occurs when the primary side of the ignition coil short circuits within the coil windings.. (Less coil windings to flow through generates a lower voltage spark (Weak Spark) And to test the coil , you need to know the primary and secondary resistance values to determine if it’s farked..
What kind of motor does a magneto drive?
It has a 2HP variable speed DC motor and variable width spark gaps. it will drive base or flange mounted magnetos. This is helpful to detect a miss from a short or leakage as well as how hot is hot enough to perform adequately by adjusting the widths of the spark gaps.
Can a non metallic resistor short out a spark?
Beware of resistor or non metallic wires, they are a big NONO with early magneto ignition systems as are resistor plugs. If there is spark but no go it could be a fouled plug. A fouled plug can short out the spark and not look dirty.
How is Magneto tested in a small engine?
Small engines can get away with less spark output. This is what gets done first with a suspected magneto issue. Step one is to test the magneto as a system with the Allen Electrical Servicer then if faulty identify and correct the defective components.