Rotax max senior kart

Question

can u convert a rotax max 125cc senior kart engine into and use it at a junior race like junior max or rotax mini max . can u use the same kart but change restrict the engine to what power it produces so you can use it in all classes of rotax

Answer 1

As far as I know you can.

Junior Max doesn't have the power valve and I know for a fact that it can be converted to senior max so the opposite is obviously possible as well.

I'm not sure about the rules of the category but it sounds impractical to change back and forth.

And the engine will have to pass tech in one form or the other, it can't be converted on race day.