
Originally Posted by
TZ350
Thanks Husa. You know, that link does not work for me, strange!!!!
Ok so now we have the up to date 2015 text with the rule change possibilities and an S after the word "Kart motor".
Option 1, a refined definition of 24mm carb equivalent that takes into account EFI and throttle plate carbs like the Tillotson pumper carb.
Chapter 24 – Road Racing – Miniature
24.2 - Engines must be derived from non-competition motorcycles. Motocross, Road Racing, Enduro
and Go Kart motors and transmission parts are not permitted. There shall be no restriction on the
make, type or design of carburettor, ignition, exhaust, piston, cam, valve springs or cooling system
except for class eligibility. All engines must be normally aspirated except F4 4 stroke engines of less
than 100cc capacity and F4 2 stroke engines of less than 70cc capacity, which may be turbo or
supercharged. F4 2 stroke engines over 104cc ; At some point in the inlet tract(s) between atmosphere and crankcase or barrel, the inlet tract(s) shall not exceed an area of 452mm2 (24mm equivalent) in total. For the purposes of measurement, EFI throttle body idle air circuit if any and carburettor air bleed jets and orifices shall be ignored. F5 4 stroke engines over 53cc are restricted to carburetion equivalent to a single
20mm carburettor
Option 2 same as 1 but without the F5 4T 20mm carb restriction
Chapter 24 – Road Racing – Miniature
24.2 - Engines must be derived from non-competition motorcycles. Motocross, Road Racing, Enduro
and Go Kart motors and transmission parts are not permitted. There shall be no restriction on the
make, type or design of carburettor, ignition, exhaust, piston, cam, valve springs or cooling system
except for class eligibility. All engines must be normally aspirated except F4 4 stroke engines of less
than 100cc capacity and F4 2 stroke engines of less than 70cc capacity, which may be turbo or
supercharged. F4 2 stroke engines over 104cc ; At some point in the inlet tract(s) between atmosphere and crankcase or barrel, the inlet tract(s) shall not exceed an area of 452mm2 (24mm equivalent) in total. For the purposes of measurement, EFI throttle body idle air circuit if any and carburettor air bleed jets and orifices shall be ignored.
Option 3, no carb restrictions at all.
Chapter 24 – Road Racing – Miniature
24.2 - Engines must be derived from non-competition motorcycles. Motocross, Road Racing, Enduro
and Go Kart motors and transmission parts are not permitted. There shall be no restriction on the
make, type or design of carburettor, ignition, exhaust, piston, cam, valve springs or cooling system
except for class eligibility. All engines must be normally aspirated except F4 4 stroke engines of less
than 100cc capacity and F4 2 stroke engines of less than 70cc capacity, which may be turbo or
supercharged.
Now if we could have no restrictions on fuel type or additives for 4T's of less than 100cc and 2T's of less than 70cc then we could see some very interesting machines indeed.
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