This is nothing new,
4 stroke engines was around for cars years ago! Theres a reason why they died out!!!
Maybe before Marks time but Kyosho Supertens used to have optional 4 stroke fitting kit, sound was fantastic! but cost was too high and OS being only manufacturer did not help that.
As i said to Mark already 4 stroke engines will come into place if they have power or price or both improvements over 2 stroke.
RPM has always been the key factor in RC and 2 stroke will always win over 4 stroke.
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