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The NCY CDI box will work on all GY6 50cc/150cc scooters made in China using the 139QMB/157QMJ enigine. Stock CDIs are pretty similar, but the components (inside) make the difference. The CDI tells coil when to fire.

If your CDI is no good, you will not be getting a pulse to coil to fire spark plug. If you have voltage in other areas and no spark your CDI very well might be no good. These do go out as well as coil and magnetos these are main parts that create spark to run your scooter. A typical CDI module consists of a small transformer, a charging circuit, a triggering circuit and a main capacitor. First, the system voltage is raised up to 400-600 Volts by a transformer 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 ignition point. When the triggering circuit receives triggering signals, the triggering circuit stops the operation of the charging circuit, allowing the capacitor to discharge its output rapidly to the low inductance ignition coil, which increases the 400-600 V capacitor discharge to up to 40 kV at the secondary winding at the spark plug. When there's no triggering signal, the charging circuit is reconnected to charge back the capacitor. Please check your CDI module with the pictures on each item page carefully prior to ordering.

•JM Star Tomahawk II
•X-Treme Several Models
•Qingqi Several Models
•Vento Several Models
•SUNL Several Models
•Various unlisted makes/models
•Tank Several Models
•Roketa Several Models
•Strada Rx 150 series
Will fit many models mentioned on our website.

Compatible with GY6 or GY6 Clone engine
50-150cc. It is universal for most Chinese 50cc-150cc Scooters & 150cc Go Karts and ATVs, Include duplicator circuits, increased RPM 6 Pin male.

So your scooter won't start huh? It can be a number of things. Such as a bad battery, poor ignition coil, or possibly a bad CDI box. Normally it's a faulty CDI box. But instead of making a purchase on a stock (factory) CDI box. This time why not buy what your scooter really needs. This time get scooter a High Performance CDI box, and add a High Performance Ignition Coil. It will be one of the BEST Investments made on your Scooter. For GY6 125cc, 150cc, 160cc, 170cc, 180cc, 190cc, 200cc (139QMB, 157QMJ).

Please verify plug connectors before purchasing

So your scooter won't start huh? It can be a number of things. Such as a bad battery, poor ignition coil, or possibly a bad CDI box. Normally it's a faulty CDI box. But instead of making a purchase on a stock (factory) CDI box. This time why not buy what your scooter really needs. This time get scooter a High Performance CDI box, and add a High Performance Ignition Coil.

It will be one of the BEST Investments made on your Scooter. For GY6 125cc, 150cc, 160cc, 170cc, 180cc, 190cc, 200cc (139QMB, 157QMJ). Please verify plug connectors before purchasing.

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So your scooter won't start huh? It can be a number of things. Such as a bad battery, poor ignition coil, or possibly a bad CDI box. Normally it's a faulty CDI box. But instead of making a purchase on a stock (factory) CDI box. This time why not buy what your scooter really needs. This time get scooter a High Performance CDI box, and add a High Performance Ignition Coil.

It will be one of the BEST Investments made on your Scooter. For GY6 125cc, 150cc, 160cc, 170cc, 180cc, 190cc, 200cc (139QMB, 157QMJ).

Please verify plug connectors before purchasing