ZDZ 420B4-J NEW!!!! Significantly improved former version of ZDZ 420B4 engine with new cylinders for higher performance and much better cooling and new improved design of crankcase. Two stroke four cylinder flat model gas engine 420ccm. Suitable for gian scale airplane models with weight over 40kg and wingspan over 4 meters. Displacement: 420ccm Weight: 10500g Bore: 52mm Stroke: 50mm RPM range 1000-8500RPM Ignition: Proc. controlled 4,8-7V Fuel mixture N95+rec.oil): 1:35 Recomm. twinblade props: 38x14,38x16, 40x12, 40x14 Recomm. threeblade props: 36x14-18 Click here for 3-view dimms drawing of this engine. Example of usage: http://www.youtube.com/watch?v=qCw51cq3-bQ Plane has over 45kg and propeller used is Biela 39x12