Question about Peg Perego Vespa Scooter

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Vespa cutting out after around 40secs of running

Hi, I have a Vespa 1967 fully restored but just av a problem with the engine cutting out after around 40secs. It runs perfectly when starting. To get the engine running again I have to take the plug out, turn the fuel off and crank it over a few times, then put the plug back in and then again turn the fuel back on and its starts more or less first kick. Anyone know what this could be?? Thanks.

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  • ant154 Dec 23, 2008

    Thanks, thats what I thought but Ive had the carburetta apart made sure the choke spring isnt sticking and adjusted the idle screw as much as possible and it still does it! not sure how to really decrease the amount of fuel anymore! Any ideas?

  • ant154 Dec 30, 2008

    Thanks for your comment, I did rebuild the carb with all new parts but the float/needle I fitted was to long which meant the needle restricted the amount of fuel getting through to the carb when the bike was running. I shortened the needle taking off only about a millimetre and this seems to have sorted the problem. Thanks again.

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Did you put back the choke (under fuel switch)
- and better rev once high in neutral after succesful start until engine gets warm

Posted on Sep 28, 2014

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Getting to much fuel apparently.But have never seen or heard of one of these.

Posted on Dec 23, 2008

  • bakuma11 Dec 30, 2008

    If you have weak spark it will run for a short time and then flood out.
    Is the plug gapped correctly? Is it the right plug? Can you screw in the idle jet all the way on a fresh plug and have it not start? If it still acts the same way fuel is getting in without it being metered. The exhausted could be resricted not letting the engine exhale. If this was the case it would have a very hard time holding high rpm's for an extended period. Might have more info for you if any of these things change your situation


  • bakuma11 Dec 30, 2008

    If the float setting is too high in the carb it will not shut off fuel in the bowl and flood excessivly.did you rebuild the carb with all new parts I've seen floats that were not cork absorb fuel and become heavy and never shut off the needle to seat seal and fuel just keeps on running through the carb. We could chat on cell phone also.

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Fuel in the carb next to air screw


on old carbs they have mechanical fule pump. you may need to look into a new one or try pumping the gas a few times while turning it over.

and it means theres fule in the bottem of the carb.... the carb is an atomization chamber for fule. if you have to much fule (ie to rich) your going to have liquid fule at the bottem of the carb. this is bad, you need to lean out the carb bar turning the idle screws the right (12 o-clock to 9 o-clock...) just a bit at a time. and play with it while it's at idle to what you think is a good idea. you can hear it trust me just play around with it.

also look at the throttle advansment lever (it shoot gas in at wide open throttle as to not stall) its conected to your throttle cable.

AND YES IT IS.... your fule will evaporate and fast if don't.

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