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1 Capacity Groups (refer to rule 5 below for specifications and restrictions within a capacity
group)
1-1 Multi-cylinder four stroke up to 450cc
1-2 Multi-cylinder and twin-cylinder production based two stroke up to 250cc
1-3 Twin cylinder four stroke up to 750cc
1-4 Single cylinder four stroke 126cc – Open Capacity
1-5 Single cylinder two stroke 126cc - 500cc
3 Fuel
Refer to rule 10-17.
4-3 Twin cylinder four strokes shall be limited as follows:
a) Up to 500cc, no restrictions apart from fuel as above.
b) Over 500cc, two valves per cylinder, are restricted to 750cc and fuel as above, over 640cc
must not be water-cooled.
c) Over 500cc three or more valves per cylinder, are restricted to 650cc and fuel as above.
Additionally these machines must retain the standard OEMair box, air filter element and
carburettor (with the exception of removable jets or throttle body, including injector).
10-17 Fuel:
10-17-1 The following classes shall be restricted to petrol having maximum characteristics not
exceeding “Avgas or Unleaded FIM” as defined in Appendix E. Motocross,
Stadium/Supercross, Miniature TT, Trials, Enduro, Cross Country, ATV, Stockbike,
Solo, All Road Race except those classes listed in 10-17-2 and 10-17-3. All Mini and
Junior classes.
10-17-2 The following classes shall be restricted to petrol having maximum characteristics not
exceeding “unleaded Super” as defined in Appendix E. No additive maybe added to the
fuel.
1. Sports Production. Appendix A
10-17-3 The following classes shall have the choice of either petrol having maximum
characteristics not exceeding “Avgas, Unleaded FIM” or methanol, both as defined in
Appendix E. Sidecars as defined in chapter 27. National Speed Records, Hill Climb –
Road and Grass, Beach, Classic Road Racing as defined in Chapter 23, Post Classic
(Period 72) Road Racing as defined in Rule 25-3, Post Classic (Period 82) Road Racing as
defined in Rule 25-4 (4 stroke engines only),Grass Track and Speedway Sidecars and
those classes of Oval Racing defined in Chapter 19 and 20 except 20-27, 20-31 and 20-32.
Any machines using methanol must display “Dangerous Goods” or other appropriate
stickers that clearly indicate its use, on the machine in a prominent place e.g. number
boards.
10-17-4 NOTE: Nitro methane and similar agents are prohibited in all classes of racing.
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