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Mine doesn't have carb heat, so I assume so (I didn't build it), but it's probably best to ask your local MDRA if he'll want to see the letter or anything else. The contact info is on the MDRA website and while I don't have experience with the others, I've found the Pacific region guy to be pretty responsive to emails. Cheers
No Carb heat on the Rotax as far as I know.