The heart of the Motus MST-01 motorcycle is the KMV4, the world’s first direct injected motorcycle engine. 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.
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.
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
Minumum 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
