the little info i can find on the robins says they're OHC motors that are nearly indestructible but little aftermarket upgrade support.
is the other tc a comet 40 type deal?
if so, money wise, it sounds like a major bargain.
power wise, looking at it in percentages, which is the only objective thing to do, it's a very significant gain.
i drove my next door neighbor's 11HP (honda) kart the other day after doing some work on it for him; it's *quite* a bit snappier than my yerf w/ the fresh clone and night & day ahead of it when it had the worn-out tec still pushing it.
just like in our 2nd-gen lead sleds, it's all about torque, not HP.
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