Headlight Booster

Want more JUICE out of your stock headlight, and do not want to modify your existing wiring. Click to learn more.

HID charging conversion

Are you tired of Battery depletion everytime you uses your newly installed High Intensity Discharge Headlight, Click for solutions.

Fixing OIL drain plug thread

Are you looking for fixing that oil drain plug that went bad and unable to thread that bolt due to loose thread, Here is an easy solution for, CLICK for detais.

Led Light Solution

Wanting to conserve battery power of your motorcycle? Why not change all of your indicator BULBS, such as signal light, tail light and brake light to LED BULBS. Click for more info.


CDI is the heart of your ignition, wanting more power than STOCK but do not want to buy such RACING CDI? You need to know how it work first to understand where to START improving the ignition. Click for more.

Horn Interrupter

Want to have a horn sounds like a machine gun that produces successive sound with only one press of the HORN switch, add spice to that annoying stock horn, CLICK for details.

Reusable OIL filter mod

Paper element OIL filter tends to suffer from clogging, so why not try this filter mod I am using with my small motorcycle for more OIL flow.

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Last Updated: July 21, 2010

Yamaha DT125 CDI

This is the diagram of a china replica CDI (capacitive discharge ignition) of Yamaha DT125 2 stroke machine. The circuit can be used on other existing AC-cdi motorcycle, as long as there is a high voltage generator on the stator.

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Inside an AC-CDI of a GY6 50cc-125cc engine. An AC-CDI is a type of ignition wherein it can be operated without a battery installed on a bike but needing a HIGH VOLTAGE GENERATOR that will charge the capacitor inside the cdi to discharge tthrough your ignition coil producing spark at the spark plug unlike, dc-cd wherein no HV generator is necessary for they have a built in converter inside.

The circuit below is from a gy6 based engine. it incorporate a pulse shaping circuit, unlike the cdi of yamaha DT125 posted here Yamaha DT125 cdi.

for more ac cdi circuits and schematic diagram click here
More Ac-cdi schematic for you...