Custom Triumph Grand Prix 1947 Triumph Grand Prix 1947 SPECIFICATIONS, PRICE & IMAGES Engine: parallel twin 500 c.c. o.h.v.; valve operation by Ignition: magneto. Transmission: chain via four-speed gearbox. Frame: cradle type with single down-tube and twin Forks: telescopic. Bike Features More Bike Specifications:Kawasaki A1 250 SamuraiBultacoAncillotti Scarab Spirit 450 by Oberdan BezziKawasaki ER-6fGoldmember by Roger GoldammerKawasaki Z 800Panster by Big Twin MotorsKawasaki KH 250