A second line of Scouts was introduced for 1933. Based on the frame of the discontinued Indian Prince single-cylinder motorcycle, the Motoplane used the 45 cubic inch engine from the Standard Scout while the Pony Scout had a reduced displacement of . In 1934 the Motoplane was replaced by the Sport Scout with a heavier but stiffer frame better able to withstand the power of the 45 cubic inch engine, while the Pony Scout, later renamed the Junior Scout, was continued with the Prince/Motoplane frame. Between the introduction of the Sport Scout in 1934 and the discontinuation of the Standard Scout in 1937 there were three Scout models (Pony/Junior, Standard, and Sport) with three different frames. The Sport Scout and the Junior Scout were continued until civilian production was interrupted in early 1942.