[7] The Topper had a 165 cc (10.1 cu in) single-cylinder two-stroke engine mounted horizontally between the floorboards.

[2][5][6] It was expected that the low, horizontally mounted engine would be cooled by air passing under the scooter,[2] but some Toppers developed overheating problems.

[11] Storage space was provided under the seat; the manufacturer suggested storing extra containers of two-stroke oil there.

[1] The main complaint from Topper owners was with the "Scootaway Drive" continuously variable transmission.

[14] In 1959 a Topper was ridden from Bakersfield, California to Death Valley and back without repair or adjustments requiring tools.