§ 02 / Category

CDI Units

The CDI fires the plug and caps the revs. Lose spark or chase an intermittent misfire and the box is the usual suspect, behind the stator and pickup. Aftermarket units run revised advance curves and raised rev ceilings — useful for tighter tracks or a built top end, pointless on a stock motor. Match the plug count and pin-out to your loom before you buy. Heat, vibration and water kill them. Filter by make and model below.