My Vespa PX125 Disc starts OK, fuel on, choke closed. After a short distance I loose power, and I have to restart with choke open to get is going again , I return choke to close ,It travals a few metres then loses power again.
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is there a way to increase the tick over speed if you can increase this it will be ok some times the metal bar that the throttle wire is atatched to bends slightley or the screw comes lose and it moves causing it to tick over more slowley
if the lock is surely open then you could use a strong flashlight and lift the seat a little with a big screwdriver (or crowbar) in the small gap between fuel tank and seat.
- then you can see the lock and try to move/turn it somehow until it pops open.
don't worry -the clunk noise is typical when changing gears on a Vespa 125 PX - it is due to a very old fashioned construction in the gearbox (1940ies) see pictures: you have to get used to that or change to a newer automatic type Vespa....
Check the main fuse near the battery, it have been poped up and needs to be replace wit the same amperage. If the fuse blow up again, check your wiring there might be a cut or expose wire that maybe grounding the body.
Try also to check the electrical connectors, it might only been disconnected or needs some cleaning up on the contact pins.
Hope that helps you out.
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You model of vespa uses about 1 1/4 pints of either 90 gear oil or SAE 30 motor oil. Please make sure you choose specific oil for motorcycles, because car motor oil will ruin your clutch discs (it has anti-friction properties that don't work well on wet clutch systems.Hope this helps!