The important determination of de-restricting a advanced Vespa scooter is to access its faculty output to hardihood faster (vintage Vespas chalk up no restrictions). Restriction of a scooter engine is normally designed to compose an arbitrary wrinkle on how hurried a scooter can be driven. This is regularly performed by the scooter manufacturer in response to local regulations. But, aftermarket mechanics can circumvent these manufacturer limitations to get it the direct mechanical output of a Vespa scooter for more useful driving Pleasure.
Cut that small pipe off and weld up the holes created. This is a minor restrictor and will not solve all your problems if you don't remove the pulley washer described above. Reinstall the exhaust when completely finished.
Button down where the limiters are on your scooter. Restrictions come in one of three forms. Some scooter manufacturers machine else than one restriction. These admit the exhaust tube, on the transmission/front variator and on the CDI (electronic controller).
2. Name which Piaggio/Vespa engine you carry. There are three contradistinctive types:
Pre-2000 Piaggio engine--No catalytic converter and Dellorto or Weber 12 mm carb;
2000 finished 2005 Piaggio/Vespa engine--Catalytic converter and 17.5 mm Dellorto carb;
2005 onwards Piaggio/Vespa engine--Catalytic converter, 17.5 mm carb and slightly lower exhaust Harbour.
De-restricting for pre and post-2000 engines is done in two parts. For the post-2000 engines, there is an extra method of adjusting carburettor jetting extremely.
3. Prepare a Disinfected business existence and cook up trustworthy all imperative tools and parts are nearby and ready for handle.
De-Restricting
4. Yawning up the Vespa engine occasion and set the outer engine pulley. Undo the outer pulley by oneself. You may longing an air-power pressure wrench or a variator locking item to successfully blockade the pulley from spinning while loosening.
Set the cylinder washer between the inner and outer transmission pulley when exposed. Remove the washer and reinstall the outer pulley. Nothing else needs to be removed. Secure the outer pulley and close up the engine case, making sure to secure all engine case nuts as needed to factory tightness. Use a torque wrench to be sure.
5. De-restrict the exhaust. The second restriction on a pre-2000 engine is a small pipe coming off the exhaust which interrupts the gas flow slightly. Remove the exhaust for the work to be done.
Instructions
Identification Issues
1.6. Make jetting changes. Post year 2000 engines require carburetor jetting changes. No jetting change is required for pre year-2000 engines.
Find the carburetor on your scooter. All post-cat Vespa models now come with a 17.5 mm carburetor. The stock main jet is either a size 53 or a 56 (pre or post year 2005 model respectively).
Take the old main jet our and replace it with a larger size main jet, two to three sizes bigger (56 or a 58).
7. Re-assemble the carburetor and close up the scooter.
8. Test the engine both in standing mode and in running mode.
