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Hi, Anonymous and the usual suspects are:
1. Fouled spark plugs.
2. Severely discharged or a damaged battery, should have 12.5 volts or better and be able to pass a load test if necessary.
3. Check battery terminals for damage or corrosion, check the battery cables at "BOTH" ends for loose, corroded, or broken connectors, "INSIDE" and outside the cable harness, perform connector wiggle test and check cables with an ohmmeter if necessary.
4. Loose connection at ignition coil or plug between ignition sensor and CDI box.
5. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose, check for spark leakage in the dark.
6. Faulty ignition coil, pick up coil, trigger coil or CDI box testing needs to be checked with an ohmmeter at 70 degrees Fahrenheit
7. Faulty safety switches clutch, kickstand, neutral, off/on etc.
8. Faulty ignition switch.
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day. Scooter Troubleshooting Scooter won start All about Scooters My scooter has no spark how to fix gy6 chinese scooter 139qmb qmb139 50cc... GY6 150cc Ignition Troubleshooting Guide No Spark BD Technical Center http://www.family-motorsports.net/GY6-50cc-150cc.pdf
you need a bit more lead
quick get you out of trouble gadget
get a lead pencil and go over all the electrical connections
including your spark plug
then check your cdi, cdi pick up, coil, lead and spark plug
the coil lead may need cutting back about 10mm
The spark plug is located on the cylinder head of the engine. Look for a really thick wire from the ignition coil. The plug is on the other end. Your plug, if a four stroke engine, is a CR7HSA, which takes a 5/8 deep well socket to remove. The CDI is a black box, sometimes in the battery box, most often under the seat bucket after its removed.