Malossi doesn't just sell you a carburetor, they give you everything you need to hook it up to your Scooter. This is a complete racing carburetor for the Piaggio Leader 125-200 Liquid Cooled Engine. You might have to cut a hole in your underseat storage bucket to make it fit. Will also fit 250cc Quasar WITH Carburetor. 

Malossi MHR PHF 34 BD 4-stroke with accelerating pump for PIAGGIO Leader for Vespa GT/GT L/GTS /GTV 125-200cc 4-Stroke LC, incl. flip-up choke, cable kit, air filter, spacer

These systems have been specially designed and calibrated for high-performance motors, and are complete with all accessories needed for assembly. MALOSSI is the leader in the design and production of special fuel systems for motorcycles and scooters.
MALOSSI systems are the result of intense research and precision drawings and calculations. The manifolds and air intakes designed by MALOSSI undergo efficiency tests and destructive tests to check their performance and reliability.
Carburetors are customized for each vehicle according to the specific characteristics of the motor and air intake, and are completely calibrated for dosage of the air-fuel mixture under all power delivery conditions.
MALOSSI produces special components for fuel systems in order to supply a product that responds perfectly to the needs of the most demanding customer. M1612265

APRILIA Atlantic 200 PIAGGIO 
APRILIA Scarabeo 200 PIAGGIO  
APRILIA Scarabeo (PIAGGIO) 125 PIAGGIO  LC
APRILIA Sportcity 125 LC  
APRILIA Sportcity Cube 125  LC  

PIAGGIO BV 200

Piaggio BV 250 CARB
VESPA GT 200 
VESPA GT L 200