Retro class:

LET'S START FROM THE BASICS: IF NOT WRITTEN, THAT IS ALLOWED, THEN CONSEQUENTLY IT IS PROHIBITED.

Engine – D4, D5, D6, D8 and (Russian origin) Modifications.
Required – factory crankcase and crankshaft, ja cylinder silindripea, carburettor, blast tube with a silencer.
Forse Call – internal engine forcing is prohibited except. Reducing the volume of the combustion chamber. No additional materials may be used to reduce the volume of the combustion chamber (a new combustion chamber must not be made). Only milling of the existing one is allowed.
Adding a clutch-side crankshaft seal to the factory crankcase is prohibited. Channel Power max 10.8mm diameter puksipoolsest end and the supply hole must be round. Karterimahu reduction forbidden. D4 / D5-type cylinders D6 / D8-type cylinder head installation banned. Processing and exchange of a connecting rod bush camp in prohibited. A connecting rod and crankshaft bearings must be in the original size. Machining of the crankshaft cheeks and the opening and channel of the fuel channel is prohibited. The maximum diameter of the piston is allowed to 39,5 mm, it is checked in the technical booth. plunger to force (Changing skirt, Add to, two-ring piston spacer ring) or the stroke length must not be changed. One of the piston ring for the pin allowed.
Maximum dimensions of the outlet ports: the width of the bottom 10,2 mm; The width at the top 12,2 mm; height 13,0 mm.
Maximum dimensions of the inlet window of the sleeve measured from the inner surface: width 11,0 mm ; height 9,0 mm. Matching cylinder overflow channels with intake and exhaust windows is prohibited. It is forbidden to add any material. Processing of cylinder windows is prohibited. Combining karteripoolte cylinder, overflow channels allowed max 10 mm from the bottom of the attachment surface of the cylinder.
Karburaator – The original carburetor, Maximum diameter of the diffuser 9.1 mm. Hood free. Air or fuel mixture ülelaadimis systems prohibited. Any openings in treatment is prohibited, the nozzle diameter of the free.
Issue – factory flame tube with original length and original diameter (the attachment of the cylinder can be replaced by a spring, with clamp etc). The damper must be in the original or modifications must meet Võrri D series. The original muffler must not be cut, truncated. Allowed the removal of sieves, welding, fastening structures. Rolled edge points are allowed to be welded. Adding any prohibited material in the silencer. Riga 13 the muffler must also have a line 13 original length flame tube.
Ignition – original contact ignition, can be used as a tractor Magneetot.
Transfer – fikseeritud ülekandesuhe(kett). Cranks must act, s.t, that is mounted on the cranks chain, works behind the wheel cranks chain retainer and the rear wheel brake clamp.
Window – the original frame of the cage (incl. front fork/ suspension, leistang, paak, fenders), the addition of reinforcements. Allowed to shorten the dirt tables, approval ways to modify and add guards of. Required license plate with green background and black numbers in front approx. 150×150 mm. The back number must be legibly placed on the jersey (number size approx. 200×200 mm or A4 size).
Power system - the mixture must come from the original carburettor, attached to the original intake manifold.
Saddle – originaal
clutch - original
Wheels – 19″, 26″ Võrri origin wheels. Originaalpidurid (trummliga).
Tires – free, naelad, ketid yeah MUU cylinder ulatuv metall on keelatud.
Pidurid – required for each wheel brake pedal.
Other - additional cooling is forbidden.
Driver equipment - The helmet, Gloves and boots are required which extend over the ankle (can be used in winter boots with a height of at least 17 cm). Long clothes.