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A "long reply" just went away.. but two things... Torque and crankshaft strength (over long term). Aircraft engines need a LOT of low end torque, to accelerate
Hey, I put a few more of Jim's 500cc four stroke with a belt reduction on you tube. Type lndc1 into the search box. That will bring you to all of my videos.
Useing the existing clutches will be difficult because of weight, how to hold the driven clutch and how to mount the prop to it. Far easier to get a belt drive
I am still amusing myself with thoughts about the 400. My latest, while lying in bed last night: If I use the 400 someday, I will need a PSRU. To build one