The Honda RC113, introduced during the Japanese GP of 1963, is a twin with the same bore and stroke as the previous RC112, 33 x 29 mm for a total capacity of 49.6 cc, but now with four valves per cylinder. Total valve angle is 72 degrees, symmetrical: both inlet and exhaust valves are under an angle of 36 degrees. Ignition is by a transistorized, breaker less system, with 8 mm spark plugs.
The carburettors are again the flat-slided type. This carburettor type builds shorter than the round slided type, and the very high engine speeds necessitate a very short inlet and exhaust length to achieve optimum wave tuning. Lubrication is by wet sump, and there are nine speeds in the gearbox. Power output is 13 bhp at 18,500 rpm; the red line on the rev counter is at 19,000 rpm, and short excursions to 20,000 rpm are allowed. Dry weight of the bike is 53 kg, lower than its predecessor through extensive use of magnesium, and a curious front brake.
The latter is the same as used on a normal bicycle, with two brake pads being clamped on to the rim. This saves total weight and unsprung weight, which improves handling. Two large, light alloy discs are mounted on the front wheel to give some streamlining.
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