Description
Check the specifications, dimensions, variation details, referenced part numbers, and available fitment evidence before matching this item to an application.
COMPATIBILITY:
GX640 type SD1 GX640 type SD1/A GX640 type SD2 GX640 type SD2/A GX640 type SD3 GX640 type SD4 GX640 type SD4/A H4518H type HSA/A H4518H type HSA/B H4518H type HSA/C H4518H type HSA/D H4518H type HSAC/A H4518H type HSAC/B H5518 type AC2/A H5518 type AC2/B H5518 type AC4/A H5518 type AC4/B H5518 type NAC2/A H5518 type NAC2/B H5518 type NAC4/A H5518 type NAC4/B H5518 type A2
What is CDI?
CDI stands for capacitor discharge ignition (alternatively, “capacitive.”) If you’re new to capacitors, they’re similar to batteries in that they can store energy for later. What sets them apart is their ability to release all that energy near instantaneously, which is ideal for an ignition circuit.
The basic CDI system is a trigger mechanism, coils, and a box, often black, with capacitors and other circuitry inside. The trigger tells the box to fire, the box determines when to fire which coil with the capacitors, and zap goes the spark plug, ad infinitum. In addition to dischargin’ those capacitors, the box may also influence your rev limit, timing advance, and other variables related to spark, but that’s it.
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