You could but the clean air police would mandate something built in the motor that would prevent you from doing so..If in fact the cost factor was overcome ..and with fuel prices and labor cost i dont see it...SuperJETT said:About a year ago I looked into this for a standup with some other people/companies. The rotaries that will physically fit in a standup hull have less torque in the midrange than a limited 2-stroke does, weight is about the same engine-engine (though the rotary would require something on the output shaft for alignment), and are much more expensive.
The output shaft is in the middle of the engine, and no matter how low you mount it, it will not align with a driveshaft in a standup, requiring some offset mechanism such as a gear/belt/chain setup which adds weight/complexity in an already tight area.
It could be done, but at a high cost. The really nice thing I was looking at was you can run them as a 2-stroke with premix.