The SHA 13/13 is the largest carburetor that fits all Piaggio Ciao, Bravo, Si and Boxer models without any further work on the engine housing.
We recommend ordering a jet set for precise tuning of the engine.
Dellorto uses a jet between 62 and 66 depending on the version ordered.
Unfortunately, we have no influence on this.
It makes sense to change from SHA12/12 to SHA 13/13 if the engine has been modified (intake port modified, intake timing adapted, transfer port adapted to the engine and cylinder)
.
On the performance diagram you can see how much more power
the engine gets
with the same
components just by changing the carburettor with jet and air filter