Sounds like you have a problem with the choke on the carburetor. I'm not familiar with this scooter. Does it have an automatic choke or manual? Is it possible for you to post a video of the problem? I will know better what the issue is after hearing it.
SOURCE: gilera 125 xv engine cuts out when reved up
Carb needs cleaned and possibly rebuilt.
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SOURCE: my gilera runner vx 125 wont start
i had the same problem if i remember correct it was a T shaped connecter for 3 tubes that had snapped cost about 50p
SOURCE: My 1999 gilera runner 50cc cut out on me,now it won't start
Remove the water trap bowl at the bottom of the petcock, (gas valve). Is there any water or trash in the bowl? Drain a cup of gas from the tank. Is there any water or trash in the cup? Dump it and clean it. With the gas valve turned off, does gas still get past the valve? If it does, then you need to replace the valve. Re-mount the bowl, ( not all bikes have a water trap bowl ). Always turn the gas off when not riding the bike. If the valve will not fully shut off the gas then a leak-down condition can occur and cause gas to get to the exhaust pipe.
Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Install a new stock NGK spark plug and try to start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.
Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb. Remove the idle screw and the air screw on the outside throat of the carb and spray into the screw holes as well.
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Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two adjusters down. Only screw these in until they LIGHTLY seat. Now turn each adjuster one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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SOURCE: gilera runner 50cc wont start
my gilera 50cc turns over but no petrol from carb 2 spark plug help also what is the valve on top of carb with the wire ...............
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I have tested the choke as per the Haynes manual and both the old one and new one seem fine, it seems to tick over ok but the second you apply the gas it stalls.
Since you've tested the choke and that seems to be working, I would next check the float in the carburator bowl. Possibly it is sticking. If the float also seems to be working, I would next check the ignition timing.
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