Coming from Max Power is the XP3.9 World Edition .12 nitro on-road engine. Built to the same specifications as used by the Max Power factory team at the recent IFMAR World Championships in Gubbio, the engine features a new crankcase with under head cut-outs to keeping compression more consistent, it comes with a new 3-port liner and CNC-machined piston for improved top speed and it utilises a dual tungsten-balanced and silicone-filled 11.9mm crankshaft. The specifications are rounded out by a US-made ceramic main bearing and a new 6-ribs silver-anodised cooling head.