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The SHA Vespa carburetor has an improved choke release trigger, that cures the sticking trigger lever problem that the regular early SHA had. In the USA it was on 1972-86 Vespa mopeds, 1983-86 Garelli VIP-N, and mid 1990’s Kinetic TFR mopeds. This style of carburetor was original on all Vespa/Piaggio mopeds 1970’s, 1980’s, 1990’s, and 2000’s.
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It has a smaller 50mm air filter flange, not 59. The Dellorto “SHA Vespa” is like a regular “SHA” but more compact.
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- re-fit it and bolt it down tight and level.Ħ3 is a stock size jet for 99 - 05 models.Ĭheck the condition of the reed petals also, you may find that they are in bad condition. apply a very small amount of instant gasket if needed. clean it gently with sand paper and fit a new gasket.
When you here the revs go up or down slightly (usually up) when you spray over a area then that is where the engine is drawing in air because it isnt properly sealed.Īddress the issue, for example if it is the inlet manifold then remove it. Spray over areas you suspect a air leak like the inlet manifold/reed block joint. Start the bike and get the revs as low as possible, use the choke if needed dont be silly and use something like deodrant or de-icer. Get a areosol of flammable contents, use something like carb cleaner spray or WD40 (id use carb cleaner spray personally). Sounds to me like you may have a air leak causing a lean mixture, since you can get it to idle OK with the choke part way on.