Published on November 5th, 2013 | by Daniel Sherman Fernandez


Erik Buell Racing 1190RX

Erik Buell Racing has answered that question many bikers have been asking by the unveiling of this 1190RX. The 1190RX has a 72-degree, liquid-cooled V-twin engine with a 106.0 x 67.5mm bore and stroke (1191cc), making a claimed 185 peak hp at 10,600 rpm. Peak torque, which on hi-po bike engines is often just 1500 revs below peak power, is way down at 8200 rpm and is 101.6 lb.-ft. That wide region of strong torque equals acceleration and rideability.

EBR worked hard on the RX’s midrange, combining a swirl port that flows strongest at low throttle with staggered opening of the intake valves to achieve old-time rotary charge swirl that speeds up midrange combustion, giving the added benefit of very low unburned hydrocarbon emissions.

Erik Buell Racing 1190RX.b

Consider the RX’s high 13.4:1 compression ratio. The danger with high compression in such a big cylinder is that combustion may not be able to outrun the chemical processes leading to detonation. In this RX, fast combustion clearly wins the race, making it practical to gain gobs of torque from such high compression. If you run the numbers at peak torque, RX makes combustion pressure that many a pure racing engine would dearly love to have.

1190RX Specifications

TypeET-V2: 72° V-Twin, Liquid Cooled, Four-stroke
Bore x Stroke4.17 in. x 2.66in. (106 x 67.5 mm)
Displacement72.6 cu in. (1190cc)
Compression Ratio13.4 : 1
Fuel DeliveryElectronic Fuel injection with 2 port injectors and 2 showerhead injectors
ExhaustPrimary + Secondary
Peak Torque101.6 ft-lbs. @ 8200 rpm (137.8 Nm @ 8200 rpm)
Peak Horsepower185 hp @ 10,600 rpm
Primary DriveGear Drive 36/65
Final Drive520 Z-ring chain, 16/41
ClutchHydraulic actuation, vacuum operated slipper
Transmission Ratios:
Overall Length80.3in. (2040mm.)
Overall Width29.0in. (737mm)
Overall Height43.7in. (1110mm)
Seat Height32.5in. (826mm)
Ground Clearance4.7in. (120mm)
Trail3.80in. (96.5mm)
Lean Angle55°
Front TirePirelli Diablo Rosso Corsa 120/70 ZR-17
Rear TirePirelli Diablo Rosso Corsa 190/55 ZR-17
Fuel Capacity4.5 gal (17.lL)
Weight (Wet, no fuel)419lbs. (190kg)
Load Capacity375lbs. (170kg)
FrameAluminum frame with integral fuel reservoir
SwingarmOptimized stiffness aluminum
Front SuspensionShowa, inverted big piston front forks
Rear SuspensionShowa, single shock without linkage
Front Wheel17 x 3.5 Aluminum
Rear Wheel17 x 6.0 Aluminum
Front Brake386mm (15.19in.) Single perimeter rotor, 8 piston inside-out caliper
Rear Brake220mm (8.66in.) Disc, 2-piston Hayes Performance Brakes Caliper

Erik Buell Racing 1190RXd

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