The Honda RC145 is directly derived from the four cylinder RC162, with the drive to the camshafts now by a gear train, taken from the center of the crankshaft. In principle it's a four without the two outer cylinders. Bore and stroke are still 44 x 41 mm.
The only difference with the four apart from the number of cylinders is the lubrication system, which is wet sump. Power is 24 bhp at 14,000 rpm. Dry weight is 103 kg, and as top speed over 180 km/h is mentioned.
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