Ultralightweight, Lightweight and Heavyweight Supervintage (Period Il)
Period II Ultralightweight class is limited to approved air cooled machines made after 1968, like the Honda MT air cooled and the Yamaha series TA, TD also limited to 200. Period II Lightweight and Heavyweight Supervintage classes are limited to thoroughbred grand prix motorcycles, and race-prepared roadster motorcycles of comparable performance and appearance, with a maximum model year of 1972, maximum displacement of 850cc, two- or four-stroke, with the following exceptions permitted regardless of model year:
Classes based upon specification and displacement:
Ultralightweight Supervintage:
Up to 200cc-single or twin 2-stroke air-cooled engine from approved list
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