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Old 11-24-2010, 06:02 PM   #16
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1970 Honda cb 450 idle problems


Aah yes in infamous honda twins that wont return to idle speed. early high mileage cb 's had this problem and when I was a mechanic it took me some time to figure out the problem. Everyone including me went straight to the carbs to fix it. The problem is that it's not the carbs creating the high idle.....it 's the mechanical ignition advancer unit located under the points plate, the 2 small springs on the centrifugal unit are sacked and continue to hold the ignition timing at full advance, resulting in high idle even though the idle screws return to closed position. As a quick fix I used to trim 1 end of the spring and fold over the next coil to effectively shorten the spring, better yet get new springs. Remember to mark the points plate before removal or be prepared to go through the whole ******* honda timing procedure again.......Vinny


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Originally Posted by cowboykp View Post
I have a 1970 Honda 450. While at idle if I hit the throttle, the engine revs up to about 3000 rpm. and stays there until I turn the Ignition off. Any ideas why? Thanks


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