The RC148, used in the GP of Japan 1965, had the same bore and stroke as the RC 114, 33 x 29 mm, but the new RC149 gets the same dimensions as the RC116: 35.5 x 25.14 mm.
The crankshaft has a special configuration: the three cylinder part has the crankpins at 120 degrees, the two cylinder part has the crankpins, in the usual Honda fashion, at 180 degrees. Both crankshaft are coupled together at the position of the camshaft drive.
The valve angle is 56 degrees, 24 degrees for the inlet and 32 degrees for the exhaust valves. Lubrication system is by wet sump, with two oil coolers in the sides of the fairing.
There's also an oil temperature gauge. The oil temperature is checked, and the coolers can be covered more or less to maintain the oil temperature within certain limits
Power output is 38 bhp at 20,500 rpm. The polyester petrol tank has an unpainted strip, to check the petrol level.
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