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James VargasOct 30, 2025
Why is my Vespa 664787 performance so poor?
- JJohn BergOct 31, 2025
Poor performance in your VESPA Scooter can stem from several causes. It may be due to clogged or dirty fuel nozzles or carburetors, which require dismantling, washing with solvent, and drying with compressed air. Other potential causes include excessive encrustations in the combustion chamber (remove the encrustations), worn piston rings or cylinder (check and replace worn parts), a clogged exhaust pipe due to encrustations (replace the exhaust pipe and check the carburation and mixer timer), or a blocked or dirty air filter (clean according to the procedure). Additionally, an inefficient starter (check mechanical sliding, circuit continuity, power presence, and electrical wiring), a slipping clutch (check/replace the centrifugal brake shoe assembly and/or clutch bell), defective mobile pu...
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