Ok I am having an idea for my next project....( well one of them anyways).. I want to put a 4 stroke in a tmaxx.... But I understand it is quite a project and a pricey one at that.... I know that O.S. made a 4 stroke kit for a few years and it was for a .40 engine.. That's all I really know... I would gladly accept you some advice, help and opinions... Thanks for any help...