Equipped with direct injection and control electronics, modern two-stroke engines have long been preparing to storm the fortress of the fuel savers, which has so far been successfully defended by the four-strokes. Even though strict emissions standards have greatly decimated the number of attackers, the defences are still being challenged.
A comparison test will show whether the four-stroke engines manage to keep the upgraded two-stroke competition in the 90 hp class at bay. The test line-up includes Evinrude, Honda, Suzuki and Tohatsu, each with two four-stroke and two-stroke engines.
If the alphabet determines the ranking, the leader of the Japanese trio is the Honda BF90. Although the cubic capacity has shrunk by 100 cc, the four-stroke engine equipped with four-valve technology and sequential intake manifold injection outshines its carburettor predecessor in every respect.
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