THE “MONSTER SUPERBIKE” WITH TRACK-PERFECT PERFORMANCE
The legendary Testastretta engine now powers the leading street fighter motorcycle. Designed with the most experienced riders in mind, who expect the best in terms of technology, performance and componentry, the Monster S4Rs sets a new standard in the category, benefiting from all the experience gained in the World Superbike Championship.
The L-twin Testastretta engine is a milestone on the historic journey of sports motorcycles. Testastretta technology allows a reduced angle between the intake and exhaust valves. The result is a clean, compact combustion chamber that is also highly efficient: the flat-crown pistons provide a perfectly smooth combustion environment and linear flame front. The special design of the heads, together with the cutting-edge electronic engine control system, guarantees optimal combustion throughout the rev range and makes for smooth, potent power delivery.
The Testastretta engine features a piston stroke of 63.5 mm and a bore of 100 mm: the short stroke limits average piston speed to allow increased RPMs and improve overall reliability. An exclusive oil pump feeding system is built into the deep sump crankcase to ensure an even oil flow rate during the most dramatic acceleration and braking, or extreme cornering.
The chassis and running gear on this bike are unparalleled. The fully adjustable Öhlins suspension at both ends is complemented by 5 Y-shaped spoke rims that improve the rigidity/weight ratio compared to traditional wheels and enable a reduction of the unsprung weight for better handling. The 320 mm twin disc Brembo brakes on the front have radial-mounted calipers with four pistons and four pads. Radial-mounting guarantees a more rigid caliper-fork mount assembly, thus improving the efficiency of the brake system.
Several details - the silencer cover, exhaust heat plate, front mudguard and cam belt covers are produced in carbon fibre, contributing to the overall weight reduction and making this Monster look even more exclusive. Even a top performance bike such as this can be environmentally responsible, as the Monster S4Rs Testastretta complies with the stringent Euro3 emission control standards.