Video by ScooterLab.UK via YouTube
Source
Sticky rides Gran Turismo’s water-cooled 292cc Rotax conversion engine for the classic Lambretta. The test is part of his Complete Spanner’s Lambretta Kit Book which is due for release in the summer of 2021.
Full article on the GT300 including the engine specification at https://scooterlab.uk/exclusive-lambretta-gt300-review-and-video-road-test/