Vespa Polini 210, BGM 60mm, Dellorto SI26 - tuning test engine - Pt. 4th
Today we found the time to have a look at the port timings of the Polini kit. With a 1mm base gasket one look at the degree disc shows us transfer port timings of 125° and exhaust timing of 172°. This results in a blow down timing of 23.5°. Figures that really worth to try […]