yearmodels 1968 and older
yearmodels 1969 – 1974
yearmodels 1975 – 1979
for bikes that have air-cooled motor, drumbrakes and twinshock or mono
with no linkage system. Yearmodels 1969 and newer are allowed.
D1 = 250cc, D2=500cc
E: Yearmodels 1987 and older. Bikes may have discbrake in front, must have drumbrake in rear, front forks may be original up-sidedown model.
Sidecars: for bikes that have originally air-cooled motor, drumbrakes. Two shock absorbers in rear, linkage system in front. Year models 1986 or older.
The bike must have parts only from the correct timeperiod or new parts which are made with same charasteristics. Carburator can be newer but it must be as close to original as possible. No carburators with accpump. If the bike has newer parts than it originally had, it belongs to class according to these newer parts. For example, bike with motor from 1975 assembled in frame from 1972 goes to class C.
Folding footrest in all solo classes. All bikes must have silencer. In paddock there must be a carpet under every bike to prevent soil pollution from oil & gasoline leaks. Stop-button is recommended.
Class A: front 180 mm, rear 130 mm measured vertically
180 mm, rear 130 mm measured vertically
Class C: no maximum measures but the suspension must not be better than was available in 1979 models. Parts from 1980 are forbidden even if they were available in 1979.
In classes A and B shocks with dual function (so called gas- or airshocks) are allowed
with external reservoir are not allowed in classes A and B.
Bikes with monoshock must have suspension structure like original (all classes).
125+175cc black plate, white numbers
250cc green plate, white numbers
500cc yellow plate, black numbers
Number must be also on the back of the rider (also passenger in sidecars). White bottom, black number.
Races may be held together with modern bikes. Classes can be combined to one race but the results are counted separately. Race consists of practice (length is determined by local organizer, normally 15 minutes) and two heats which are 10 minutes + 2 laps.
In case of a dispute regarding the content in a translation of this document, the Finnish original is in priority.