Top Screen Type F-Form Aperture size 45 x 45 mm with 8 mm Thread.

Top Screen Type F-Form Aperture size 65 x 65 mm with 10 mm Thread.

Top Screen Type F-Form Aperture size 70 x 70 mm with 12 mm Thread.

See drawing for further measurement.

airstart – rading: 374 BHP – 340 BHp – continuely v/1250 rpm