The tuning experts at MMW have been developing and producing special high-end engine tuning components for Vespa and other Piaggio two-stroke engines for a number of years. Their CNC machined barrel-valve manifolds are capable of elevating the heart rate of a Vespa tuner! The extra length of the port is ideal for high RPM engine set ups and the moved power band also produces more torque. The enlarged inlet section allows for a higher intake gas velocity. Combined with its gas-flowed design the cylinder receives huge amounts of fresh fuel charge every stroke of the piston! Aluminum valve barrel manifold, made by MMW, machined from solid CNC, The kit includes a rubber connector, but without valve barrel. We recommend the valve tube produced by a Yamaha RD350 or TASSINARI, both with four petal tubes. The crankcase does not require any extra material to be added by welding, the original pressure engine openings can still be used, kit includes all fixing material. 30mm, fits: (rubber link SIP 0135) TMX 27-30mm Dell`Orto PHBH 28-30mm / VHST 24-28mm / VHSH 30 KOSO / Serie Pro 28-32mm 36mm 35mm. Suitable for: (SIP0136 rubber connection) TMX 32-35mm Dell`Orto VHSB 34mm KOSO / Pro Series 28-32mm 39mm SIP TIP: Don’t forget to order a TASSINARI four-reed valve (# 27422000) and material of the liquid or paper seal.