Author Topic: CB550f tapping noise  (Read 509 times)

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Offline peteuk

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CB550f tapping noise
« on: September 13, 2016, 06:53:09 am »
I own a 1977 Honda cb550f. It has developed a tap tap tapping noise that sounds like it's coming from number 1 cylinder exhaust tappet. I have removed the cover and there is no obvious damage the cover. The strange thing is tho that if I disconnect number 1 spark plug the noise stops. As soon as I reconnect the plug cover, the noise returns. Any ideas would be greatly appreciated. Thanks......Pete

Offline calj737

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Re: CB550f tapping noise
« Reply #1 on: September 14, 2016, 05:16:54 am »
Certainly check that the valves are properly adjusted on that cylinder. Remove and reinstall the spark plug, ensuring its properly seated. And lastly, it may need a new exhaust gasket. These are one-use crush copper O-rings. If the exhaust has been removed, then re-installed without replacement, its very possible that you've developed a leak and are not sealing the port.
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Offline Stev-o

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Re: CB550f tapping noise
« Reply #2 on: September 14, 2016, 06:50:26 am »
+1 on Cal's suggestions and then do a vacuum sync on the carbs.
'74 "Big Bang" Honda 750K [836].....'71 Honda 750K project.....'76 Honda 550F.....K3 Park Racer.....K5 Fiddy Dolla Special!......CB500 Fiddy Dolla Special too!!............plus plus plus.........