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CB350/400 / CB400/4 Poor Acceleration and running
« on: April 27, 2012, 10:53:10 AM »
CB400/4 Poor Acceleration and Top End
Hi, I’ve just bought a 1976 CB400F. The general condition of the bike is good however there is a problem. Poor acceleration and top end performance.
The engine revs freely and appears okay up to 4000rpm about 40mph but then appears to bog down and takes an age to reach 60mph. The max speed is 70mph but acceleration thereafter is non-existent. Before I go to work can anyone offer possible explanations? I have orders carburettor overhaul kits from Dave Silver in anticipation of the carbs being at fault. However would these symptoms indicate an ignition problem? Any advise would be greatly appreciated. Ta Paul
Hi, I’ve just bought a 1976 CB400F. The general condition of the bike is good however there is a problem. Poor acceleration and top end performance.
The engine revs freely and appears okay up to 4000rpm about 40mph but then appears to bog down and takes an age to reach 60mph. The max speed is 70mph but acceleration thereafter is non-existent. Before I go to work can anyone offer possible explanations? I have orders carburettor overhaul kits from Dave Silver in anticipation of the carbs being at fault. However would these symptoms indicate an ignition problem? Any advise would be greatly appreciated. Ta Paul