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the Vespa ET2 50 has a two-stroke engine which needs an oil mixture in the gasoline. There are 2 (two) tanks under the seat: 1 is for gasoline and the other for 2T-oil.
If you dont't fill that oil tank the engine will run dry after a couple of miles and the bearings in the motor blow up.
Then you need a complete rebuild of the engine which costs a lot.
I'm not familiar with ET2s but I had a similar problem with a Vespa 100 years ago. After hours of messing about i discovered a bolt had fallen and blocked one of the air inlets on the bottom of the frame. Was fine when i kicked it but when my bum was on the saddle it kinda 'sealed' around the tank area and starved the engine of air. As i say, i don't know about new ET2s but sounds kinda similar symptoms.
there is only 1 fuse on an et2 and if the horn, starter and indicators work, then this iis not the problem.
It is most likely the battery which is at the back of the speedo. to get to this you need to remove the mirrors and screws from the handlebars, split the casing, disconnect the speedo cable and all electric blocks (carefully) and turn the speedo over. there is a little round plug that needs to be removed and the battery is behind it.
I think it is a rechargable battery, so replacing it with a normal battery will only work temporarily.
There is an adjustment screw on the carburetor facing towards the back wheel. You have to reach down about finger length. With the engine running and the ET2 on its stand, turn the screw until the engine revs up to a level you r happy with.