Over the last few years there have been several indications that Suzuki is deadly serious about its turbo bike project. After the Recursion concept's initial 2013 showing, the firm followed up by revealing its XE7 engine at the 2015 Tokyo Show. Plonked on the Suzuki's stand with little explanation, the XE7 was far more developed than the original Recursion's engine. Whereas the Recursion's mocked-up motor was a 588cc SOHC design, intended to make 100 hp, the XE7 was clearly a real piece of engineering with intent for mass production. Featuring a DOHC cylinder head and a much more compact turbo and intercooler arrangement than the Recursion, it appeared to be a higher-performance design. The XE7 name hinted at a 700cc capacity, and the adoption of a twin-cam head pointed at a higher-revving design intended for much more performance.