(AC or DC) Your CDI has two plugs, a 4-pin and a 2-pin. The 4-pin side may have 3 or 4 wires connected to it (both AC and DC versions). If the 2-pin connector has only 1 wire going to it, it's a DC CDI. If there are 2 wires attached to the 2-pin connector, then it's an AC CDI.
What is the difference between AC and DC CDI?
The AC-CDI ignition system is the most common CDI in small engines. The module gets its power solely from the alternator in form of alternating current. DC-CDI. This kind of CDI is powered by a battery. The system comes with a DC/AC inverter circuit to raise the voltage from the 12V DC up to 400-600 V DC. What is a DC CDI ignition?
What is an AC CDI capacitor?
Well; NST as “AC CDI” . A capacitor, by laws of physics, Must be changed With DC. This “AC CDI” isn't CDI AT All, a power dump thru a triac or hi frequency power transistors.
What is an AC CDI module?
"AC-CDI - The AC-CDI module obtains its electricity source solely from the alternating current produced by the alternator. The AC-CDI system is the most basic CDI system which is widely used in small engines
How do I know if my scooter CDI is AC or DC?
In this regard, how do I know if my CDI is AC or DC? Turn the scooter key to the "On" position and, using a test meter or test light, check if there is current at the CDI. If there is 12 V at the CDI it is a DC CDI, if there is no voltage at the CDI it is an AC CDI.
Is a 5 pin CDI AC or DC?
SPECIFICATIONS: PINS: 5. TYPE: ALTERNATING CURRENT (AC) COMPATIBLE WITH: 12v SYSTEMS.
Are Chinese scooters AC or DC?
Many scooters with chinese 2 or 4 stroke engines are mounted with different types of CDI. They are either AC type : Alternating current or DC type : Direct current. To find an unlimited CDI, you must first identify the type of ignition you have. The easiest way is to do this, engine running, with an electric tester.
Can I use any CDI unit?
Because ignition characteristics (particularly timing) vary widely across vehicle models, there's no one CDI box that can cover them all. The CDI must be matched to the engine that's being worked on.
What is a DC CDI ignition?
Capacitor discharge ignition (CDI) or thyristor ignition is a type of automotive electronic ignition system which is widely used in outboard motors, motorcycles, lawn mowers, chainsaws, small engines, turbine-powered aircraft, and some cars.
How does AC CDI work?
The CDI utilizes capacitor discharge current toward the coil for firing the spark plugs. A Capacitor Discharge Ignition or CDI is an electronic ignition device that stores an electrical charge and then discharges it through an ignition coil in order to produce a powerful spark from the spark plugs in a petrol engine.
Where is the CDI on my scooter?
0:161:09How to replace the cdi box on your scooter with a performance cdi boxYouTubeStart of suggested clipEnd of suggested clipAll CDI boxes are located in different places. Some are in the battery box some under the seat thisMoreAll CDI boxes are located in different places. Some are in the battery box some under the seat this one is under the seat.
How do I test a CDI with a multimeter?
First take the leads of the multimeter and connect them together. If you are using a digital multimeter then you should hear a beeping sound. Measure for continuity between all the ground and the various other points. If your cdi is working well, you should not hear any sounds.
Can a CDI box cause weak spark?
The COIL can give weak spark in spite of the spark being triggered by a CDI box. If you have an anemic yellowy spark from the plug then I would suggest to check that all of the connections are clean and tight.
What makes a CDI box spoil?
The CDI goes bad because of different reasons. Some of them go bad because they are old, others experience a wiring short while others go bad because of a faulty charging system.
Where does the CDI get power from?
AC-CDI Module The power source for this module is the AC generated by the alternator. It is the most common CDI system used in small engines and usually goes under the magnetized flywheel.
Are stators AC or DC?
The stator is the coil of wire housed inside the engine case. A magnet on a shaft spins within the stator, creating alternating current (AC). That current travels along fairly heavy gauge wire through the case and into the rectifier/regulator which converts it to DC power, and at a consistent output.
What is the voltage from CDI to coil?
Typical CDI module First, the system voltage is raised up to 250 to 600 volts by a power supply inside the CDI module. Then, the electric current flows to the charging circuit and charges the capacitor. The rectifier inside the charging circuit prevents capacitor discharge before the moment of ignition.
How to tell if a CDI is AC or DC?
Not all DC CDIs are larger any more thanks to IC technology but do check the 2-pin connector in the CDI, this is the most accurate way to tell. 1 wire is always DC, 2 wires is almost always AC (one being black/white clinches it). Visualize Whirled Peas. Shoutbox.
Is a 2 plug CDI a DC or AC?
Also look at your CDi does it have a 4 plug and 2 plug connector? If the 2 plug connector HAS ONLY one wire it is a DC CDI if it has two wires going to the 2 plug connector it is a AC CDI. ALso the DC CDIs are bigger than a regular CDI because it has more elcetronics to accept the DC voltage from the Battery. pete.
What is a DC CDI?
This kind of CDI is powered by a battery. The system comes with a DC/AC inverter circuit to raise the voltage from the 12V DC up to 400-600 V DC. This DCI is slightly larger than the AC-CDI ignition systems. DC-CDI modules enable precise ignition timing and make it easy to start the engine even when it is very cold
Which is better CDI or AC?
The DC-CDI works well in areas where there is extreme cold temperatures and is very precise during ignition. The AC-CDI on the other hand, is simpler and rarely runs into problems.
What is a CDI circuit?
A typical CDI consists of a charging circuit, small transformer, a main capacitor, and a triggering circuit. The system raises a voltage of 400-600 volts by the transformer. This current is then channeled to the charging circuit and to the capacitor.
What is discharge ignition?
The capacitor discharge ignition is generally used in lawn mowers, motorcycles, outboard mowers, chainsaws, in some cars and turbine-powered aircraft. However, most of the cars use inductive discharge ignition that is different from CDI systems. A typical CDI consists of a charging circuit, small transformer, a main capacitor, ...
What is the DC-CDI ignition system?
There is also another form of ignition system that closely looks like the DC-CDI system but was used by the older engines and was called Energy Transfer. It included a coil under the flywheel which generated a very strong DC current pulse when the flywheel magnet moved close to it.
Is CDI a good system?
The CDI system is insensitive to shunt resistance and can fire multiple sparks at once and thereby great to use in various applications without any delay once the system is started.
