Author Topic: Why did I ever take it apart... Getting back into it after indefinite "hiatus"  (Read 705 times)

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Offline Lavis500

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So my '73 CB500 project has been in pieces and on hold for over a year and a half due to moving, deployment, and general lack of time since I've been back.  After gathering more space and more tools, I'm finally prepping to finish up the project.  Things on my list to do:

-Remove front wheel (AGAIN) to remove and replace wheel bearings (AGAIN) because at least one is in cock-eyed
-Replace front forks with a different used set that doesn't have JBweld holding the drain bolt in >.<
-Replace fork seals on the good set of forks
-Replace valve springs
-Lap valves
-Blast, clean, and reassemble engine.  (Debating paint)
-Clean and reassemble EVERYTHING ELSE.

As I was moving things in the garage today, I took a decent look at my cam.  I noticed that the #1 intake lobe has some light pitting on it.  I don't have the proper gauge to measure it, but I would call it very moderate.  Hopefully I can post a pic up tomorrow.  It's the only lobe on the cam with any pitting, and none of the tappets are pitted.  All of my lobes measure within spec.  Is it going to cause accelerated wear, or will I be fine to use it?

Another thing:  I looked at my head as well.  I realized I was getting some light rust on my valve seats.  Now, I haven't replaced my valve guides because I had no lateral play in them, and I haven't re-cut the seats because I previously didn't need it.  Before going on hiatus I properly lapped my valves, double checked my work with prussian blue, reassembled, and did a leak check with kerosene.  Low and behold:  it failed.  Since all of my parts were properly mated up, conventional knowledge suggests weak springs.  Now that these seats are starting to rust, do I need to re-cut them?  Can I simply clean, lap for a good seal, and reassemble?  None of my smaller local shops offer valve cutting, and I've been trying to avoid a machine shop since my build is financially limited.  That may be my ultimate undoing, though...

Somebody, please help me feel better.  Despite how far I've gone, the tunnel only gets longer, and the light from the train grows ever brighter...
"Whatever it is, I swear I didn't do it!"

'73 CB500 - Sally

Offline dave500

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just re lap them again,are the valve guide seals new?itll be ok.

Offline Rigid

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Keep wrenching on it and you will have a day very soon with a real sense of satisfaction and accomplishment.  As far as the cam, pitting on the lobes is very serious and will lead to accelerated wear.  As stated above, the valves can be relapped.  Tighter springs won't cure leaking valves, the leak test should be done with no springs.  When you check your valve seal contact band with prussion blue, go very light on the blue and never rotate the valve.  Just in and out.  I would suspect you have slightly warped or worn valves that may, or may not lap to seal completely.  Thank you for your service by the way. 
36 years of this stuff, here to help.

Offline Lavis500

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just re lap them again,are the valve guide seals new?itll be ok.

Yeah, the seals are new.  I've got new seals, gaskets, and o-rings for everything.

I'll have to go look for it, but I thought there was a thread from Hondaman about having the valves assembled for the leak test.
"Whatever it is, I swear I didn't do it!"

'73 CB500 - Sally