How to Check a Motorcycle Ignition Coil Turn off the motorcycle ignition. Disconnect the spark plug wires from the coil by hand. Measure the resistance between the coil connections for the spark plugs with an ohmmeter. Measure the resistance between the two smaller primary wire connections on the coil with an ohmmeter.
How do you diagnose a bad ignition coil?
Use a spark tester to check the ignition coil. Plug the tester into the coil. Attach the ground wire. Plug in the coil connector. Adjust the spark gap to the correct measurement. Start the engine. If there’s spark, great, it works! If there’s no spark, it’s a bad coil.
How do I test my ignition coil without spark?
Disconnect the ignition coil wire from the distributor and install the spark tester to the wire and ground the tester to the engine. Crank the engine for a few seconds. If there’s spark, the problem is with the distributor cap (carbon tracks or wear) or rotor. Consult your vehicle repair manual, if necessary.
How do you test a motorcycle ignition with a multimeter?
Set the voltage meter at 12 volts and reconnect the red meter clip to the grey wire terminal. Turn the ignition key to the “On” position. If the meter shows a reading, the problem was a wire connection. The lack of a voltage reading or a reading substantially less than 12 volts indicates a faulty ignition switch.
How long do motorcycle ignition coils last?
Typically, modern ignition coils will last 3 days or 30+ years without much trouble in between. But that doesn’t mean they can’t go bad — and some do. Replacing one during the life of one of these bikes would be unexpected, though; replacing two indicates that you’ve got another problem in your ignition system.
How does a motorcycle ignition coil work?
Motorcycles use a coil to ‘step-up’ the battery’s voltage to the correct range. An ignition coil is a transformer consisting of two separate coils of wire, wound around a central post. The coil’s primary winding consists of a few turns of heavier-gauge wire.
Why is my ignition coil not firing?
If the ignition coil does not have spark, it’s time to check its wires. Use a test light to check the continuity on the signal wire and power wire on the ignition coil. If both wires are functional but the coil fails to produce spark, the ignition coil or the ignition control module is bad.
Why is my pit bike not getting spark?
Remove the spark plug from the cylinder block. If you don’t see a spark coming from the plug, replace the old plug with a new spark plug (recommended for your pit bike) and retest. This test will determine whether or not the missing spark issue is related to the spark plug or other electrical component.
Why the ignition coil does not spark?
Loss of spark is caused by anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. This includes worn, fouled or damaged spark plugs, bad plug wires or a cracked distributor cap.
How many ohms Should a coil read?
Most coils should read between 0.4 and 2 ohms. Zero resistance would indicate a shorted coil while a high resistance reading would indicate an open coil.
How do you test a 12V ignition coil?
To check your coil, ensure you have 12V going to the positive terminal. Once you confirm that is the case pull the wire out of the centre of the distributor and hold it a cm away from the distributor centre terminal. Have someone crank over the engine, and there should be a nice blue spark..
Should there be voltage on negative side of coil?
The power from the ignition switch need to go to the plus side of the coil and the negative goes the the distributor on a 12v system. That should be opposite what it was on a 6v positive ground.
How do you test an ignition lock cylinder?
Put the ignition key into the ignition switch and crank the engine. If the engine cranks, then your ignition switch is obviously working fine. If the engine does not crank, and you hear a “click” when you first turn the key to the “III” position, then your ignition switch is not the problem.
Are cheap ignition coils any good?
While low-grade coils cause misfiring and difficult starting, using them can have more serious consequences. As coils are controlled by the engine management computer (ECU) they rely on fly-back voltages that are fed back after the spark plug has been ‘fired.
What does a magneto do on a motorcycle?
The magneto is a self-contained generator of high voltage that provides ignition to an engine through spark plugs. The moment the contact points open, a rapid magnetic flow generates a high voltage in the secondary coil, which ignites the spark plug, thus firing the engine.
Will bad CDI cause weak spark?
no ill-will intended here!) when two opinions conflict, it is usually the person saying that a CDI can have a weak spark giving a cursory, almost general-seeming diagnosis, i.e. “yes, cdi’s can give weak sparks.
How do you test a coil pack with a screwdriver?
Place screwdriver near the engine block Place the screwdriver about 1/8″ from the engine block. While someone else cranks the engine, you should closely examine the gap between the engine and the screwdriver. If your ignition system is working properly, you should see a spark here.
Is there a fuse for the ignition coil?
It is usually located in the fuse and relay panel beneath the hood, and is responsible for providing power to the vehicle’s ignition system, and some of the fuel system’s components. Usually a bad or failing ignition relay will produce a few symptoms that can notify the driver of a potential issue.