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TAMIYA Motorcycle Series No.39

About the Honda CBR400F Endurance
Racing that is done with a manufacturer's production machine, rather than one produced only for racing, is in a class by itself. In motorcycle racing this is called the Tourist Trophy (TT) race, and comprises only machines that were manufactured for street use. Almost every maker of motorcycles is now marketing vehicles that will fit into the TT-3 formula races, as it is very popular for beginning riders. The famous Honda Company released their CBR400F in 1983 for this exciting event and followed it in May of 1984 with half and under cowl versions and in August 1984 with the fully cowled Endurance Special Edition.

With the changes in Japanese motorcycle regulations now allowing cowlings on the machines, Honda elected to release the first CBR400F without cowlings and it quickly gathered much attention due to the advanced mechanics and innovative "Revolution Modulated Valve Control" (REV) system employed. The CBR400F uses an inline 4 cylinder engine with four valves per cylinder, but the REV system automatically reduces this to two valves per cylinder at RPM's under 8200 where most street running is done. Using the engine oil pressure as the force to activated the system, a pin is inserted into two of the cam lobes per cylinder, activating all four valves at the higher RPM's. This system was developed to combat two opposing problems. Enough torque at the lower speeds and more power at the higher RPM's. During competition, a simple mechanical adjustment locks out the system so that all four valves per cylinder are in operation at all RPM's. The engine is mounted in a steel square tubing double cradle frame and the Honda original Pro-Link suspension is used at the rear and their TRAC system with anti nose dive function at the front forks. Both front and rear wheels are the light-weight Comstar units as used on the Honda Grand Prix racer NS500. The full cowling comes from Honda's experience with racing and has the air cooling intake below the twin headlamps, giving it a fierce competitive look. The full cowling provides a more aerodynamic surface for higher speeds and greatly reduces fatigue in the rider during endurance races.