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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
CDI, Coil, and stator . . . what does each one do?
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[QUOTE="jmics19067, post: 530572, member: 27963"] if you want just enough info to be dangerous then I can help you! the windings under you magneto flywheel do nothing more than produce electricity preferably at the proper time the magnet passes the windings you will have a properly timed pulse. the cdi monitors the pulses and adjusts the timing for how fast the pulses are<engine rpm>. the coil does nothing more than take your electricy that you already produced and transforms it into a higher voltage so it can jump the spark plug gap. If you have an ohmmeter and a service manual for your bike take some readings according to the manual of the stator and the coil. if they check good take off your flywheel cover and hook up a timing light. you can use a regular automotive timing light you just need to hook up the power wires to a battery. start up the bike and observe the timing marks with the flashes of the light as you rev up the engine the timing should advance and as you start really wringing it out the timing should start to retard again. If it doesn't and your ohm meter readings are ok you have a good chance of the cdi being bad. if it was hard starting and a dull spark I would start to suspect either the stator windings or coil windings either not producing or not transforming the voltage high enough. and use the ohmmeter readings to help confirm it. and the most important thing I ever learned about electricity is if you see a bad wire it is bad if you see a good wire it still could be bad [/QUOTE]
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Dirt Bike Mods & Maintenance
CDI, Coil, and stator . . . what does each one do?
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