I assume you are asking about two strokes. The short answer is no. The crank has little to do with the overall timing, but the piston and cyliner lining is what provides the real timing. You could play with opening up the ports, but it likely wouldn't do much for you. Todays engines will run a range of prop sizes and across a range of RPMs. Few of us fly, or drive with a full open throttle all the time. The engine has to be able to idle down and also has to run well over a wide range of RPMs. The prop/rpm references is what you can expect from the engine.

If it's all out speed you are after, you can go with a tuned pipe to ring out every bit of power your engine has. You can also play with different fuels to gain a bit more. All of this results in an engine that isn't going to last as long.

Now, if you are a skilled machinest, you can make new sleeves with different port configurations and you can play with differen piston skirts and dome shapes. It would be a lot of expense and time for questionable results though.

On the four strokes, you would have to grind different cams. there isn't a way to make fine adjustments to the cam timing, and if you go off by one tooth, the engine runs poorly.

Don