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RETROL R30 4.2cc Panhead-Style V-Twin Engine Model is a compact panhead-style 4.2 cc V-twin that presents a distinct head and external architecture fr..

RETROL R31 4.2cc OHV V-Twin Gasoline Engine Model is a ready-to-run 4.2 cc air-cooled OHV V-twin with motorcycle-inspired external styling and visible..

RETROL R34 4.2cc OHV V-Twin Gasoline Engine Model is a 1:5-scale, ready-to-run 4.2cc overhead-valve V-twin gasoline engine mounted on a wooden operati..