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Check the main jet is set up correctly. Make sure there is plenty of fuel in the float chamber, if not check the fuel line again. There should be a good amount of petrol flowing from the carb feed pipe with the fuel tap on. It should fill a pint container fairly quickly.
Check that the gas tank is vented. If the vent is blocked then the fuel being used by the engine will gradually cause a vacuum in the tank and it will cease to flow, causing the the engine to cut out. Most motorcycles are vented through a small hole in the gas cap or a separate hose to atmosphere. It has to be vented someway.
just look around until you find it.
Hi, Roger the brake system on your scooter isn't rocket science and should definitely last longer than 3000 miles, take it back to the original shop and politely demand satisfaction, if you get pushback/dancing from the person you talk to, email me at firstname.lastname@example.org with the person's name and contact phone number, if it's in the USA, and I will call on your behalf and convince them to repair your scooter at no charge, trust me I relish these type of situations. If you would like to be more informed about your scooter you will need a service/owners manual if you can't find the best tool you ever bought for your Vespa, despair not, for a mere zero $0 you can download another one.
For more information about your issue and valuable "FREE" downloads that you will need please click on the blue links below. Good luck and have a wonderful day. VESPA GTS Super 300 ie 2008 User Manual this is a service man. https://www.oemmotorparts.com/oem2.asp?M=vespa VESPA Super 300 User Manual Vespa GTS 300 2011 https://en.wikipedia.org/wiki/Vespa_GTS
older Vespas without separate Oil-tanks need a premix of 1:50 oil in the gasoline - but yours is an automatic oil-mixer type.
check the oil-level-glass under the seat near the choke.
it must be full of oil - the oil tank can hold about 1 liter of 2-stroke oil. How much oil did you fill in?
Probably the previous owner removed the oil supply tube and filled always an oil-gasoline premix. You better ask him about it. If the tube was removed then there was no oil supplied to your engine and it got stuck and the engine bearings are blown.
you have probably got a blockage in either the fuel filter or carb,so first check filter,if ok check carb.take fuel line of carb turn engine over see if fuel comes out if it does then filter ok if not change filter,
put an additional petrol pump in the fuel line ,they cost about150€ from the bosch agent ,connect in line and splice the feed from the pump in the tank ,that will cure it ,these cars suffer from a dodgy connection in the feed wires to the pump in the tank,they corrode and get hot in the connector head of the unit .An additional pump releaves some of the load and will keep it going evan if the one in the tank plays up .