the water-cooled sohc two-cylinder eh was first seen installed in the first generation honda acty truck introduced in july 1977, and later in the 1985 honda today. it was based on one bank of cylinders from the horizontally opposed four used on the honda gold wing gl1000 motorcycle, with which it shared the bore. the horsepower rating of the engine was at 5,500 rpm, and at 4,000 rpm. when installed in the today, max power was raised to at the same revs, and torque at , with a compression ratio of 9.5:1.