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.

Related Posts with Thumbnails

Last Updated: August 20, 2010

DC-CDI schematic (updated)

DC-CDI counterpart of AC-CDI is an ignition analog or digital that uses low voltage external power supply to work. the difference AC-CDI needs external High Voltage COIL no battery configuration whereas DC-CDI needs a battery without HV COIL.
DC-CDI schematic diagram

Looking at the picture on the left, it is a complete schematic diagram of a dc-cdi. Its a 4-pin system, comprising pick-up input, battery +12 volts in, Gnd, and Ignition coil out pins. There is no High Voltage  input pin like those of AC-CDI. If it will be differentiated with the AC-CDI here, you will notice theres a transformer diagram on this schematic.The circuit on the RED BOX comprises the internal High Voltage generator of a DC-CDI, where the 12 volts battery in will be converted to 200-400 volts depending on the design of the inverter. This design uses two transistor dc-ac converter with external on/off circuit to charge and discharge the capacitor BLUE BOX via SCR. the HV converter is controlled by the circuit on GRAY box, that as soon as the pulse conditioning circuit sense the pick-up coil will send triggering signal on both SCR and HV oscillator respectively to turn them on and off at the right time.

CDI or Capacitor Discharge Ignition, from the name itself, capacitor is very critical during its operation, must handle charge and discharge time as well as heat being generated by the whole circuit inside the block box, that is why manufacturer uses special capacitors specifically made for ignitions, and not just like those mylar capacitor found on some electronic circuits. They are rated 400 to 630 volts. ranging from .47uf up to 2.2uf. Value is also so critical in every applications and designs. In this circuit, they use 1uf / 400 volts with HV out of 200 volts will equals to 20 mj.

Last Updated: August 13, 2010

Zeus 508w Visor Light

This is my helmet, as you can see the outer edges of the visor emmits blue light without having the entire visor, the visibility was not affected unless your visor have scratches and dents, that the light will penetrate too. Some people think its kind a dangerous to put light that will affect visibilty, but this mode does not as lights will not be focus directly to your eyes unless you concentrate looking at it instead of focusing on the roads.
This mods takes a little time to assemble and make.
You just need
  • two cellphone supebright leds,
  • a length of enamel wire at least number 26AWG, and or any unused earphone wire thats enameled coated.
  • a li-ion battery preferably 4 volts, 
  • a push button tact switch and
  • a know how to solder.
just take out the visor, and put the leds on each two edges.

Last Updated: August 12, 2010

Another Motorcycle Voltage Regulator

This is a circuit for regulating the output voltage on small engines. This circuit will work on engines that were originally equipped with a shunt type of voltage regulator. It is common on motorcycles, skidoos, ATVs and other recreational vehicles. This circuit was tested out on a Suzuki GS400E motorcycle and seems to function fairly well.

The above picture in comparison with the other voltage regulator posted here SCR regulator was, this one uses differential amplifier to detect battery voltage and control SCR .This has a number of advantages over using a zener diode to directly trip the gate of the

 These are:
1)If the battery voltage is forced above 13.5V, the circuit limits the current into the gate of the SCR 
preventing damage to the regulator when changing the battery 
2)The circuit is more stable over temperature. 

The main drawback is that the circuit is leaky. The differential pair should be connected after the ignition
switch to prevent the battery from draining when the engine is not used for a long period of time. This
connection is shown as MONITOR in the schematic. The output of the bridge rectifier ties to the battery at
the BATTERY connection.

With the differential pair, the base input for Q2 is connected to a voltage reference consisting of D1 and
R9. The base input for Q1 is connected to a voltage divider that monitors the battery voltage. When the
voltage on the base of Q2 is higher than the voltage on the base of Q1, Q1 will turn on shunting all of the
current from R5 to ground. When the voltage on the base of Q2 is lower than the voltage on the base of
Q1, then Q2 will turn on. This will shunt the current of R5 through the limiting resistors to the gates of the
SCR. The SCR will turn on and short out the phase. Since the stator voltages are AC, the SCR will reset at
the end of the cycle when the voltage reaches 0.