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The Honda Magna is a cruiser motorcycle made from 1982 to 1988 and 1994 to 2003 and was the second Honda to use their new V4 engine shared with the VF750S Sabre and a few years later a related engine was fitted to the VF750F 'Interceptor', the later models used a retuned engine from the VFR750F with fins added to the outside of the engine. The ...
Manifold vacuum, or engine vacuum in a petrol engine is the difference in air pressure between the engine's intake manifold and Earth's atmosphere. Manifold vacuum is an effect of a piston's movement on the induction stroke and the airflow through a throttle in the intervening carburetor or throttle body leading to the intake manifold. It is a ...
Although carburetor technology in automobiles reached a very high degree of sophistication and precision, from the mid-1980s it lost out on cost and flexibility to fuel injection. Simple forms of carburetor remain in widespread use in small engines such as lawn mowers and more sophisticated forms are still used in small motorcycles.
The system usually consists of a tube, a one-way valve and a vacuum source (such as the inlet manifold). The unwanted gases, called "blow-by", are gases from the combustion chamber which have leaked past the piston rings. Early engines released these gases to the atmosphere simply by leaking them through the crankcase seals.
The Honda CBR1000F Hurricane is a sport touring motorcycle, part of the CBR series manufactured by Honda from 1987 to 1996 in the United States and from 1987 to 1999 in the rest of the world. It is powered by a liquid-cooled , DOHC , 998 cc (60.9 cu in), 16-valve inline-four engine .
As the airflow through the carburetor increases the reduced manifold vacuum pulls the power valve open, allowing more fuel into the main metering circuit. In a two-stroke engine , the carburetor power valve operates in the opposite manner: in most circumstances the valve allows extra fuel into the engine, then at a certain engine RPM it closes ...
Honda, alarmed that they were losing their hard-won reputation for reliability, moved to introduce the VFR750 motorcycles featuring gear-driven over head cams and a very high build quality. The first three or four iterations of VFR motorcycles re-established Honda's reputation for quality, and the motorcycles received almost universal praise ...
The Honda VF750F is a street bike designed by Honda from 1983 to 1985. It has an 86 hp (64 kW), liquid-cooled, V4 engine which sports dual overhead cams (DOHC). The V4s were started a year before with the 1982 Honda Magna VF750C and Sabre VF750S [2] but were adapted for the VF750F in 1983 by reducing the six speed transmission to a five speed because of the change from shaft drive to chain.