i have a 50 cc scooter the engine won’t start after i mess around with the idle

i was trying to stop my scooter from stalling at low speed but while i was tuning the idle it just stop working i was adjusting the air to fuel screw and it stop i tried to put it back where it was at first but nothing try to remove the spark plug and cleaning it but still no result i check the spark plug for a spark and it dose a nice big spark i did notist that my spark plug was very wet tho well that it
Experienced mechanics share their insights in answering this question :
It is possible that you could have flooded the carb when you adjusted the air/fuel screw. I would keep the screw where it is at and let the scooter sit for a while to let the fuel disperse. Once the scooter has sat for a while, keep trying to start it and it should start up as long as the screw is adjusted to the same location that it was in the last time it was running correctly.

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Check the Engine Ignition and Fuel System: In most cases, the problem with a scooter not starting but with power is caused by an issue with the engine; either a bad spark plug wire, bad plug or a fuel system problem.
This situation gets worse when your scooter simply dies and stops running when you come to a stop. Typically this situation is caused by two things: A fuel delivery problem. An electrical problem.
If you experience that your scooter shuts off or cuts out while riding, it most likely means that your circuit breaker has been tripped. Check your circuit breaker and see if it is very warm or has loose wires. Make sure the wires are secured properly. Overloading or steep inclines can cause the breaker to trip.
Check the ignition system– If your bike is not starting after a rain, another potential cause is that your ignition system is wet. The inductor and the switches are two sites that can cause problems. Oxidation will lead the coil windings to fail if water has crept into the coils or alternator.
The motorcycle engine often stalls at idle after warm up.

The dreaded stalling issue when the engine is warm is the most common idle problem and it is mostly related to the very lean air/fuel ratio on the modern fuel injected motorcycle engine.

There are basically three issues that can cause this problem; bad fuel, clogged fuel filters, or carburetor / fuel injector issues. The best way to solve this issue is to empty the fuel tank, inspect all fuel lines and filters, and clean the fuel system (carburetor or fuel injector).
Starting problems are almost certainly due to carburetor and/or fuel delivery. Check your tires and be sure to inflate them to their correct pressure before riding the scooter. Also check that your lights are working – headlights, indicator lights and brake lights.
When your electric scooter doesn`t respond, check if the main ignition fuses are turned on. If it`s not, switch it on, and start the engine again. If it doesn`t start, you need to replace it with a new fuse. It`s best to have a technician remove and replace your broken fuse for your safety.
Starting problems are almost certainly due to carburetor and/or fuel delivery. Check your tires and be sure to inflate them to their correct pressure before riding the scooter. Also check that your lights are working – headlights, indicator lights and brake lights.
The most common and identifiable cause is a dead/faulty battery or improper wire connections. Some other common reasons that might prevent your motorcycle from starting could be a lack of fuel, low oil levels, or even substandard electrical connections. But first, Make sure to clean electrical contacts.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

i have a 50 cc scooter the engine won’t start after i mess around with the idle
ANSWER : It is possible that you could have flooded the carb when you adjusted the air/fuel screw. I would keep the screw where it is at and let the scooter sit for a while to let the fuel disperse. Once the scooter has sat for a while, keep trying to start it and it should start up as long as the screw is adjusted to the same location that it was in the last time it was running correctly.

Vehicle won’t start, once it’s jump started it only stays running until you turn it off, then it work start again without jumping.
ANSWER : Hi there. There could be two problems here. It is possible that your battery is bad and will not take a charge from your alternator while driving. In that case every time you shut your car off you will not have enough juice to start it again. Inspect your battery – it should have at least 12.5 to 13 volts to start your car, if it doesn’t you will need to replace the battery. The second problem could be that your alternator is bad and not charging your battery, in this case you will need to replace your alternator. Both the battery and the alternator can be tested in your car. If you would like to have the car checked for you, a certified professional from YourMechanic can come to your car’s location to diagnose the starting problem and proceed with repairs.

The car crank but won’t start
ANSWER : Hi there. This does sound like an issue with the wiring. If the check engine light is coming on every now and then this means that when it does not come on there is no power to the computer. This can be the wiring harness issue or an ignition switch problem. I would have to test for voltage to the computer when the problem is occurring to be able to find where the issue lies. If you need assistance, a certified YourMechanic technician can be dispatched to your location to inspect your vehicle’s non-start issue and suggest any necessary repairs.

Engine cranks but doesn’t start when warm, idling around 1000 RPM in park.
ANSWER : Hi there. Check the idle air control valve (IAC) and see if its sticking. The IAC valve controls the engine’s idle and makes sure that the engine idle is set to the factory setting of 650 to 750 rpm’s. If your engine idle is high around 1000 and every time you shut off your engine, the IAC valve may stick causing the engine idle to be too low making the engine not start until the IAC resets. I recommend seeking out a professional, such as one from Your Mechanic, to help you with your no start situation if you have replaced the IAC valve.

My car won’t start, neither does my auto. Start. Sometime it might start if I jump it sometimes it won’t.
ANSWER : Hi there. There are a number of issues that will make a car hard to start. Everything from the electrical system to the fuel system to the actual starter itself can be the problem. Finding the root cause of a hard starting engine can take some investigation. Ignoring a hard starting issue can further damage the vehicle, which will often result in a more expensive repair. You might want to have a mobile mechanic complete a car is hard to start inspection so they can pinpoint the source of the issues you’re having and recommend the right repairs be completed.

Car won’t start. The check engine light, battery light, and oil change light are coming on. I tried jumping the car and nothing happened. Why won’t my car start?
ANSWER : Hi and thanks for contacting Your Mechanic. If sometimes your vehicle will start with the new alternator and sometimes it won’t, then there is a loose connection in your charging system. Check all of the wires to the alternator and to the battery. Make sure that the battery cables are clean and tight. Make sure that the wires to the starter are clean and tight. A loose ground to the ignition system will cause the vehicle to not crank over. Check all of the ground wires from the battery to the starter. Make sure that they are clean and tight. If you need further assistance troubleshooting your no start situation, then seek out a technician, such as one from Your Mechanic, that can assist you.

Fuel pump engages. Batery good, alternator good volts, jump start helps when wont start. Temp does not matter. Intermittent?
ANSWER : Hello. Thank you for writing in. There are several reasons your vehicle may only start when jump starting. The first and most common is a build up of resistance that is causing you to need a boost of voltage to get the engine started. This may be due to poor battery cables, a bad ground connection, a poor starter solenoid, and a couple of other issues. The first thing you want to do is perform a visual inspection of the starting system. Make sure there is no corrosion build up in the battery cables. You can also check the resistance across these wires and make sure you have a solid connection between components. You then want to make sure the starter solenoid is doing its job. It is responsible for taking the small amount of electricity sent by the ignition and turning it into a huge electrical charge that is strong enough to push over the engine with the help of some gear ratios in its favor. Do some more testing, and stick to the basics before assuming its something seriously complicated.

My polo 3 won’t start when engine is warm or exposed to the sun for a long time
ANSWER : Hi there,
The problems you are having with your vehicle, may not be easy to diagnose. Apparently, under hood temperature and ambient temperature both create the no start condition. Components can act-up with temperature change. Assuming no check engine light is on. The no start condition will have to be duplicated and inspected at the time of no start. This will help identify what is wrong. So many things can keep the vehicle from starting. I recommend having the vehicles no start condition be inspected and diagnosed by a certified technician from YourMechanic.