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CISON FG-VT9 9cc Air-Cooled V-Twin Gasoline Engine is a finished 45-degree OHV V-twin platform with 9cc displacement, air cooling and selectable engin..

RETROL R29 4.2cc Knucklehead V-Twin Engine Model is a 1:5 ready-to-run 4.2cc OHV V-twin inspired by Knucklehead motorcycle-engine architecture, suppli..

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 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..