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Hi, I do a lot with these bikes, I think if you are getting a weak spark there is a couple things to check. First, do you understand how it builds the power to create the spark? The magnet in the flywheel has to be very close to the magnito or coil, if the gap is too much it will cause a weak spark, if the magnet is weak, weak spark, if the coil is shorting internally, weak spark. If the plug wire is damaged, weak spark. I hope this helps you.
to start with is it a 4 stroke or 2 stroke. If it is a 2 stroke the oil goes in with the petrol. If a 4 stroke look for a removable plug in the crankcase
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.
Most scooters need the rear brake lever holding in for the starter motor to work. If it is not as simple as this the carb may require cleaning out as the bike has stood for some time.
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