Details”A large diameter stock carburetor paired with a performance oriented cylinder kit are essential components in the pursuit of what every serious tuner desires: More speed! A larger carburetor leads to higher rpm, greater performance and consequently, a higher top speed. The TM flatslide carburettor with an individually adjustable fuel pickup pump, manufactured by MIKUNI, is a ‘must have’ component when tuning a VESPA four-stroke engine. Their main advantage over the standard ‘curriculum vitae’ type carburettor is the directly operated throttle valve, which avoids the slow response caused by the internal vacuum actuated diaphragm system. The result is a more direct throttle response combined with significantly improved acceleration. TM28-1/TM33-12 Carburetor Main Jet: 115/127, 5