The Honda “BF 115” four-cylinder is part of a family of three engines built on a displacement of 2,354 cubic centimeters and delivering 115, 135, and 150 horsepower.
The cylinders use a long-stroke configuration, with bore and stroke measuring 87 and 99 millimeters respectively, and they breathe through DOHC valvetrains with four valves per cylinder. On the “150” model, however, the valvetrain also incorporates the “VTEC” variable valve timing system, making the BF 150 mechanically quite different from both the BF 115 and the BF 135.
The latter, in turn, differs from the entry-level engine through the presence of the “BLAST” system, designed to facilitate quicker acceleration onto plane. Shared across all units are the Honda “PGM-FI” fuel-injection system, which also serves as the engine’s central control unit, and the “ECOMO” function, aimed at minimizing fuel consumption during cruising.
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