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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
? 2:29 https://www.youtube.com/watch?v=UU4S0Ov9q4c
Aug 24, 2012 - Uploaded by Rolling Wrench
Purchase our "NO SPARK KIT" click the link below: ... Myscooter has no spark how to fix. gy6 chinese scooter 139qmb qmb139 50cc 150cc .... i have a 2003 panterra fusion scooter with a 49cc motor,i just purchased a new cdi box,new coil wire and a new stator and ... Put gas in it tried it again nothing.Missing: rto
RTO 150cc scooter no spark Questions & Answers - Fixya
Hi, Anonymous if you have a CKP sensor it needs compression to send the correct signal to the ICM/ECM, make sure both spark plugs are in heads and use a grounded third plug to check for spark or hold spark plug cable close to spark plug in the head. If still not getting spark the usual suspects are:
1. Fouled spark plugs.
2. Discharged battery, 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.
3. Loose connection at ignition coil or plug between ignition sensor and module.
4. Spark plug cables in bad condition, shorting / leaking, spark plug cable connections loose.
5. Faulty ignition coil or ignition / electronic module
6. Failed CKP, CMP, or BAS sensor.
7. Faulty ignition switch.
8. Security alarm failing to disarm needs reset
For more information about your issue and free downloads that you will need please visit the websites below. Good luck and have a nice day. Scooter Troubleshooting Scooter won run All about Scooters My scooter has no spark how to fix gy6 chinese scooter 139qmb qmb139 50cc... http://absolutelyscooters.net/service-manuals.html CPI Scooter Parts Racing Planet USA Free CPI Motorcycle Service Manuals for download
You need to check for a spark. There are a few ways to do this. The easiest way is to remove the spark plug and put it back in the spark plug cap. Then ground it to the engine - you should be able to lay it against a non-painted portion of the engine. Make sure there is good metal-to-metal contact. In a semi darkened area, attempt to start the scooter. You should see a definite spark at the tip of the spark plug. It's hard to see in direct light. If the color of the spark is blue, that means it's a strong spark. A white color is less strong, and a yellow color is weak. Most scooter starting systems are a bit weak (compared to cars). Even a yellow spark should start your scooter just fine.
The spark must occur at the right time. Just about all scooters made since around 1980 have an electronic ignition. These systems can rarely be set. In general, the spark occurs just before the piston reaches the top of it's stroke. There is a slight delay between the spark plug fire and the fuel-air mixture ignition. That's why the spark occurs a little early. Most ignition systems have an advance unit build in. As the engine speeds up, the time of the spark retards a little bit. This helps the engine fire the mixture at the proper time.
Install a new spark plug (especially if the engine is a two stoke). Clean or replace the air filter as necessary. The carb, air cleaner, and exhaust pipe are all carefully tuned to work together. Most scooters absolutely WILL NOT run correctly if any of these parts are changed in a haphazard manner!
Double check all connections, then crank your scooter for 10-15 seconds. Did it start? Do you hear any popping? It should sound like the engine is trying to run. Most scooters will not start if you apply throttle while cranking. If the scooter catches, but doesn't start, let it rest 15 seconds before trying to start it again.
It is definitely frustrating when you can't get your scooter or moped started. The first thing you'll need to do is to narrow down the problem. In order for your gas scooter to start, it really only needs 3 things:
1. Your scooter needs to spark at the correct time. 2. Your engine needs the proper fuel/air mixture and exhaust flow. 3. You need sufficient engine compression.
Top 9 Reasons Why Your Scooter Won't Start:
1. Try depressing the brake handle when starting. 2. The battery has not been charged. 3. The battery is hooked up wrong. This is often the reason for blown fuses. 4. There isn't enough gas or two-stroke oil in the scooter. 5. There is a gas flow problem, especially on the Euro Scooter or Yamaha models. 6. The spark plug wire is not connected. 7. A low battery or bad relay can cause the scooter to only start by using the kick starter. 8. There is no spark to the spark plug. The coil is bad and needs to be replaced. 9. Turn the key to the "on" position.