Hi steve, Rotax is most common around here; i live 5 mins drive from buckmore, and i have a TKM 2 stroke and there's never any around. Although i go to bayford meadows in sittingbourne - TKM 2 stroke is non-existent here basically, but the rotax engines are sealed so you can't fiddle with them. The GX engines are used in Prokarts, and i think there's a champ for them at bayford, but i don't know. As another option there is always TKM 4 stroke. They race in a championship called F6 which runs right here in the south-east. The engines are also sealed, but form what i understand the racing is very close. And there fast, only a seconds or two shy of the rotax's.
Hope this all helps, Thomas........
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