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@me you can find the regulations on the FIM website, but if you can't be bothered to look it boils down to this:
Cylinder head covers must be sealed so the timing system is not accessible.
The timing drive system must be sealed so it is not accessible.
Cylinder head and cylinder blocks must be sealed so that they can't be removed from the engine.
The crankcase must be sealed so that it can't be opened.
IOW crank, conrods, pistons, valves, camshafts and any timing mechanisms for the valves can't be swapped. Anything you can get to without breaking the seals is fair game. If the team break any of the seals then the engine will be counted as a new one once resealed.
Oh and from a couple of races back the six engines must all have the same bore and stroke.