Vespa Polini 210, BGM 60mm ,Dellorto SI26 – tuning test engine – Pt. 4
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 […]