The DELL`ORTO float chamber cover that has been revised by DRT has a bigger valve as well as a float needle with Ø 5.2mm. The 0.7mm drill hole means enough mix always flows through at full throttle.
On these covers, the supply hole from the float chamber to the main jet should be drilled out from 1.5mm to 2mm or 2.5mm.
Conclusion: An excellent upgrade for the original SI carburettor. Ideal for full-throttle steady largeframes.
SIP-TIP: The SIP Fast Flow 2.0 fuel tap is also a perfect add-on (Art.-Nr.15878100).
SIP Community user fregnilla78 (on part no 128295T7): „INSIEME ALLO SPESSORE DELLA SIP SCOOTER MIGLIORA ALLA GRANDE LA RIPRESA E LO SPUNTO, E INSIEME ALLA MARMITTA SIP ROAD LA VESPA DIVENTA VERAMENTE DIVERTENTE...“