With the Lambretta cylinder kit marketplace being at saturation point, it’s quite rare to get an old-school cast-iron porting job through the door these days, which is exactly what happened recently. A customer, Barry, popped in with his 175cc cast-iron powered Lambretta, running original carb and airbox, along with a lower end expansion pipe. The concern he had was that although he could get his little scooter up to a speed that he was satisfied with (customer indicated circa 60mph – I’d say, based on dyno results, plus accompanying racks/spare wheels, screens etc, that it would be closer to a GPS 50mph) that when he hit a hill of any kind it would lose speed like someone had strapped a parachute to the scooter, and then it would cut out at the top of the hill (I’d suggest fuel starvation in the float bowl from an undersized float valve while screaming up the hill in third gear).
We got the scooter on the dyno to first assess the power output of his engine in its
