Highlight Motor oil The MOTOREX barrel has a long tradition but, like the brand and company it represents, still continues to develop. This development is now reflected in the drum’s new design. The days of sluggish one or twocylinder 4-stroke engines for motorcycles are past. The latest models demonstrate that modern 4-stroke engines still harbor significant potential for performance. Motor oil plays a significant role as a “construction factor” in this development. Revamped drum design 4-stroke innovation The new drum design is intended to express more strongly the intrinsic values – i.e. the high quality – of MOTOREX’s range of lubricants and care and cleaning products. There’s no doubt that the MOTOREX drum is an important “ambassador” for the brand. The proof can be seen throughout Switzerland and in the main export markets every single day. The drums, in their unmistakable eye-catching MOTOREX green draw attention to themselves everywhere – just as they have been doing since the MOTOREX brand was launched in 1947. Engines revving, front tires are straining against the bars of the starting gate; only seconds to go before the pack is released… these are tense moments that every motocross competitor knows intimately. Inside the engine, the same tension is building. With lightning response, the moving parts on the crankshaft must accelerate to the required speed and must transfer the torque with the minimum possible loss. Front-cover starts of the type delivered by multiple-time world champions such as Stefan Everts are possible only with the correct material and absolute mastery of the sport. Increasingly lighter 4-stroke engines New materials and manufacturing processes enable tremendous savings in weight. Coupled with multiple-valve technology and modern ignition systems, maximum power can now be wrung out of every drop of fuel. The results are instant response and significantly higher output and torque over a wide range of speeds. Achieving these goals also involves increasingly tighter clearances. In a KTM 450 SX Racing engine, only 0.04 millimeters separate the piston from the cylinder. Given their average piston velocity of 36.7 m/s, the metal surfaces must slide on a hydrodynamic film of motor oil at all times in order to ensure that they are pro- tected from wear. The purpose of these increasingly tighter clearances is the best possible utilization of the combustion pressure. Fully synthetic CROSS POWER 4T SAE 10W/50 With the development of its new multiviscosity CROSS POWER 4T motor oil in SAE 10W/50, MOTOREX has broken new ground in the advancement of the latest generation of high-performance 4-stroke bike engines. Fully synthetic base oils and a sophisticated additive package guarantee that the lubricant will meet the stringent demands placed on it over its entire range of application. Proven on the racecourse, the outstanding coupling behavior of CROSS POWER 4T is convincing, and it prevents undesired slippage of multiple-disk clutches in the oil bath under all conditions. This feature is underscored by compliance with the JASO MA specification. In close cooperation with KTM and various motocross teams, CROSS POWER 4T was tested over a long period under every conceivable condition. It is therefore eminently suitable for use in the latest generation of all 4-stroke off-road bikes. 10 6 7 Photos: supplied KTM The pistons, moving at up to 36.7 meters per second, are separated from the cylinders by a clearance of only 0.04 millimeters. The current crankshaft for the KTM 250 SX is roughly 200 g lighter. The engine responds instantly and revs up without hesitation.