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 KLE 500Kawasaki VN 900 Vulcan CustomKawasaki VN 650 Vulcan S CaféKawasaki Ninja 650Ducati Pantah 350 by Capêlo's GarageBig Battery SE by Paolo di GiustiKickboxer Subaru WRX Powered Motorcycle ConceptLe Rider by Panda Moto