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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.
Hi, Dsam4darren 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. 49cc 2 stroke engine scooter has no spark Help My scooter has no spark how to fix gy6 chinese scooter 139qmb qmb139 50cc... https://absolutelyscooters.net/service-manuals.html CPI Scooter Parts Racing Planet USA CPI Formula 50 2009
The ignition timing may have been disturbed,or if it is equipped with a carburettor,the mixture setting may have been disturbed,or the carb.jet may be blocked by dirt in the fuel or the spark plug may be faulty .get all these checked first .