Motus MST Prototype




Make Model.

Motus MST Prototype




Four stroke, 90º V4, dual OHV, pushrod, chain-driven single cam; hydraulic lifters


1645 cc / 100 cu-in
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
Bore x Stroke 86.5 mm x 70.0 mm / 3.41in x 2.75 in
Valves Intake Ø44.5mm (1.75in); Exhaust Ø36.8mm (1.45in); stainless steel
Cooling System Liquid cooled
Compression Ratio 11.5:1

Ignition Sequence

TDC -- 345º -- 435º -- 630º


Electronic CDI 
Starting Electric

Max Power

120 kW / 161 hp @ 7800rpm

Max Torque

165 Nm / 16.7 kgf-m / 122 lb-ft @ 4500rpm


Wet, multi-plate


6-Speed sequential gearbox; unit construction

Final Drive

Chassis Chromoly tubular trellis spaceframe; engine as stressed member
Rake 26º
Trail 108 mm /4.25 in

Front Suspension

43mm inverted telescopic forks, fully adjustable

Front Wheel Travel

120 mm / 4.7 in

Rear Suspension

Twin spar chromoly swingarm; fully adjustable pushrod monoshock with remote preload adjustment

Rear Wheel Travel

120 mm / 4.7 in

Front Brakes

2 x 320 mm floating discs, 4-piston monoblock radial calipers

Rear Brakes

Single disc, 2-piston caliper

Front Wheels

3.5 x 17, aluminium; Michelin Road Pilot 2CT tires

Rear Wheels

6.0 x 17, aluminum; Michelin Road Pilot 2CT tires
Seat Height 787mm / 31 in

Dry Weight

227 kg / 500 lbs

Fuel Capacity 

22.7 Litres / 6.0 US gal / 5.0 Imp gal

After much waiting, Motus Motorcycles finally launched its MST sport-tourer to the public today. Unveiled at the Barber Vintage Motorsports Museum in Motus’s hometown of Birmingham, Alabama, the American motorcycle manufacturer will head to Florida for the Progressive International Motorcycle Show on Thursday, March 10th for a more public showing.

Developed in conjunction with Pratt & Miller Engineering, the Motus MST features the KMV4 motor, a 1,645cc V4 push-rod style engine that include gasoline direct-injection technology (GDI). Power for the Motus MST prototype is said to be 161hp @ 7,800 rpm; 122 lbs•ft of torque @ 4,500 rpm, while the bike tips the scales around around 500 lbs dry. Motus will be riding the MST around the United States to show off their work, meet with supporters, and look for dealers interested in carrying the line.

“We are so proud to show the world the MST series,” said Motus President, Lee Conn. “We poured our hearts and souls into these motorcycles and hope that it shows in terms of the quality and character of the machines. The MST’s are exhilarating to ride- a very powerful experience unlike any other motorcycle I’ve ever ridden. There is usable power everywhere in rev-range, excellent feedback from the road, very responsive to inputs and….the sound of the KMV4 still gives me goose bumps every time one cranks.”

We think you’ll either love or hate the Motus MST’s design, as there parts of the bike that strike us as being very elegant and others that appear more unpolished. The good news on that is because Motus will be proving the bike on a cross-country trek, stopping along the way to talk to motorcyclists, the opportunity for input on the bike’s design and features should be pretty high before it enters the market likely as 2012 model. We can’t wait to see the MST when it ventures out to San Francisco later this year.

Source: Asphalt and Rubber