> Anker laura That's a tough one. You can't build a bigger carburetor on unless you make your own inled for it. And as far as I know there are no fast exhausts (like that bi turbo or something) that fit on it without alterations. You can try and see if it will go faster with making the exhaust portal in the cilinder bigger. 2 mm up and 1,2 to the sides should increase speed. make it nice and square. Robbert
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