Vespa 150cc Super Sprint GL GTR VBB VNB VBA Port Pinasco 177cc Iron Cylinder Kit Pinasco is one of the few manufacturers to offer tuning cylinders for the early Vespa large-frame rotary vane engines with only two overflow channels in the engine housing. These were first used by Piaggio in the Vespa VNB in 1959 and continued to be used in the basic concept well into the 1970s. With the Sprint Veloce came the so-called three-channel flushing, a further overcurrent channel which additionally supports the now already used reverse flushing. All well-known manufacturers of tuning cylinders have designed their cylinders for these engine housings with three overflow channels. If you…