New 140 BHP KMV4 GDI Engine from Motus

MST-01 sports tourer photo
Soon to be featured in the MST-01 sports tourer, the world’s first direct-injected, liquid-cooled V-4 motorcycle engine, comes from Motus Motorcycles. Aimed as a competitor for the Honda VFR 1200, the MST-01 motorcycle is scheduled to enter the market sometime next year. However, before the bike is completely finished, Motus provided us with a glimpse at the development of its KMV4 engine.

The video, which can be found below this article, shows the design of the KMV4 engine with 40mm throttle bodies, dual overhead valves and cam-driven fuel pump, producing a minimum 140 bhp at 7800rpm.

You might want to watch it to the end, as the guys also dyno tested the KMV4 so you will also get to hear how this beast sounds. And yes, we also felt the adrenaline rushing...

“We designed the KMV4 from a clean sheet because the ideal engine for a new American sport tourer did not exist. We needed the engine to offer a wide, smooth powerband, low maintenance and an exhaust note that only existed in our minds at the time,” Motus says.

“After studying all the various engine configurations, valvetrain options, fueling technologies, and bore/stroke combinations, the ideal engine platform for the Motus MST-01 emerged and we now call it the KMV4,” they added.

The guys at Motus Motorcycles also revealed the technical specs of the new KMV4 engine:
  • Engine type - 1645cc (100ci) liquid-cooled 90º V4; dual OHV; pushrod; chain-driven single cam; hydraulic lifters
  • Transmission - Motus 6-speed sequential gearbox; unit construction; wet multiplate clutch
  • Bore x Stroke - 86.5mm (3.41in) x 70.0mm (2.75in)
  • Compression - 11.5:1
  • Valves - Intake Ø44.5mm (1.75in); Exhaust Ø36.8mm (1.45in); stainless steel
  • Dimensions - 610mm (24in) L x 492mm (19in) W x 508mm (20in) H
  • Performance - Minimum 140bhp @ 7800rpm; 162Nm (120lb-ft) @ 4500rpm; 8000rpm redline
  • Materials - 356-T6 cast aluminum block and heads; forged steel crank, cam, rods; forged aluminum pistons; linerless Nikasil bore
  • Firing order - 1 - 4 - 3 - 2
  • Ignition Sequence - TDC - 345º - 435º - 630º
  • Crankpin Offset - 75º
  • Minimum Octane - 87

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