Author Topic: CB 550K Oil Light & Tach Issue  (Read 1104 times)

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Offline Chicago550

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CB 550K Oil Light & Tach Issue
« on: April 19, 2011, 10:53:44 AM »
My apologies in advance if this has been covered before I looked but didn't see any thing specific.

I'm wondering if I can get folks input on some issues that I'm having before I do anything drastic. I've got a 75 CB550K and after a long ride last fall my oil light went on and my tach stopped working. I decided to order the parts over the winter that I thought were the problem (and if not well, I could always use spares).

So, I get the bike out of winter hibernation and get to work. I took off the shifter side engine cover and noticed that there was a decent amount of oil all over the place. I cleaned it up and checked the oil level and it's ok. According to the shop and clymer manuals the oil light culprit could be the pressure switch, grounded/damaged wire or oil pump. I didn't think it was the switch since I replaced it last year but I got another one just to be safe.

I replaced the switch with the brand new one from honda started the bike up and the oil light went out. So, I thought my problem was solved. I went for a ride and the light is now back on. I removed the tappet covers and there is oil there so what gives? Should I remove the oil pan next and check the oil pump?

Now, for the tach. I replaced the cable with a new one from honda and the tach seemed to work again but is now making a high pitched noise when the rpms go above 3k. I did notice that there is a little bit of oil leaking out of the tach drive seal. Do I need to replace it and if so how do I remove the seal without damaging anything?

The clymer manual says that you place a wood screw in a hole and pop it out. Well, there isn't any hole besides the one for the bolt that holds the tach cable in place. Do I need to drain the oil from the bike and then pry out the old seal? Sorry for the newbie questions, this just has me stumped.


75 CB550
70 CB350 gone to new home

Offline Nortstudio

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Re: CB 550K Oil Light & Tach Issue
« Reply #1 on: April 19, 2011, 09:15:15 PM »
I'm sure someone will jump in here with some real help, but I can tell you that my speedo made the high pitched squeal (not tach).  Some folks on here told me that it could be as simple as the cold temperatures making the cable noise. 

It did it all winter, and then since the temp has warmed up a bit, it's gone.

Have you been having these issues in cold weather?

Good luck.
1976 CB550K...in progress
1975 CL360...eventually custom
2009 Husqvarna TE610

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Offline Chicago550

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Re: CB 550K Oil Light & Tach Issue
« Reply #2 on: April 19, 2011, 09:40:39 PM »
I just noticed the noise after replacing the cable the other day. It was in the 50's so not that cold. My plan is to look into it next week when the weather hopefully warms up.
75 CB550
70 CB350 gone to new home