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Suzuki and Norton both built Wankel engine powered bikes back in the 1970s. I'm not sure if the Nortons made it to market, but there were Suzuki models in the showroom and on the roads. From personal experience with Mazda - the pickup in my case - the rotor tip seals didn't make it to 100,ooo miles and by that point it was very smoky. Wankel engines have the same problem as two strokes in that the intake and exhaust ports are open simultaneously causing some loss of the incoming charge, hence less than optimal fuel efficiency and emissions.
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