Model Engine displacement Power output (max.)
220 391 cc (23.9 cu.in.) 10.0 HP at 3,600 rpm
444 (1969-1976) 512 cc (31.2 cu.in.) 14.0 HP at 3,600 rpm
444 (1977-1985) 512 cc (31.2 cu.in.) 14.0 HP at 3,600 rpm