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Messages - Kai.chris

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 16, 2025, 03:35:23 PM »
Thanks for the offer of having a look when you're feeling better.
I'll keep my eyes on the net, hopefully one comes up. Failing that I'll have to stick the least worn of the four, back in.

I wish you a speedy recovery. Sounds like you're making good progress considering what you've been through.

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 16, 2025, 12:33:16 PM »
There's no stock showing now because I bought them all earlier today. I know, after saying I wouldn't, just couldn't resist it. Might not get another chance.
I had 1 from silvers £25 odd, no picture showing so I hope its the right one.
Another was from CMSNL along with 8 rockers, picture was showing that as correct.
Final one was from an eBay seller in Netherlands, that one cost £40 with the postage  :-\

Have you actually found these shafts in used covers that aren't worn out? All of mine have a lip I can feel with my nail, where rockers have rubbed into the shaft.
I thought to just flip the shafts round in the case so the rocker is rocking on the unworn area of the shaft, they'll still be too loose but should hit the cam lobes at the right angle instead of on one side.

I was going to send the rockers to Newmans but I'm assuming the price to refurb them isnt far off new anyway.

Could you be persuaded to sell just one of your good pinned shafts please? ;D

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 16, 2025, 10:03:57 AM »
Definitely has the pinned type Oddjob. Part 14451-323-020 with the cut out. Later cover must have been fitted as the bike is a 72'
As you said the ones without the cut out there's plenty about, typical  :-\. A chap in Germany on eBay has 10 of those for sale currently. They're shorter than the cut out version so can't even be modified to fit.

The 3 correct pins I've found will cost me about £110 in total, I don't want to go on those until I find a 4th. 8 new rockers will set me back a further £200.
Bryan has kindly offered to sell me cam, so that solves a major part of the problem.

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 15, 2025, 09:14:57 PM »
Thanks Bryan.
My cylinder head is currently with a local specialist having the valves cut in, won’t have started it yet.
Would it be unwise to say throw your spare cam on my cylinder head, or are
your cam and head matched? How much does it really matter for a bit of gentle back lane riding. 
I’ve managed to source 3 of the 4 rocker pins NOS but they won’t be cheap.
Am I overthinking it all, tempted just to knock that rough piece off the cam and throw it back together. £2k in parts and now this, the gift that just keeps on giving  ::)


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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 15, 2025, 07:12:10 PM »
Not sure how to proceed now. Closer inspection of the cam, rockers and rocker pins shows worn pins where the rocker rocks as mentioned by Seabeowner.
The knock on effect looks like a ruined cam and rockers wearing on one side.
One cam lobe has a crack near the edge, it looks like the other side of same lobe had the same issue and somebody has taken a grinder to it. All lobes have uneven wear and pitting to some degree.
I was going to send the cam to Newman cams but without new pins(unavailable) and rockers (£22 a pop) there doesn't seem much point in re-profiling the cam anyway.
Where should I go from here? new head, cam and cover out of the question.


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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 10, 2025, 11:32:31 PM »
Rev counter worm drive bore is also riddled with pin holes.
It must have been very poor to begin with. It’s not corrosion and can’t be wear in those locations as others have pointed out.
Possibly trapped air during casting, known as gas porosity.

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 10, 2025, 11:12:41 PM »
The cover does indeed have the pinned shafts.
Bike was originally an import from Italy over 25 years ago.
Good to hear I don’t need a new cover, bike has already broken the bank several times over. 

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CB500/550 / Re: CB500 K1 rocker cover woes
« on: September 09, 2025, 08:17:19 PM »
Thanks for your reply.
I was thinking the same, or it was a poor quality casting to begin with.
Just spent 4 hours polishing the top of the bloody thing as well  ;D :'(

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CB500/550 / CB500 K1 rocker cover woes
« on: September 09, 2025, 07:45:40 PM »
Just started to clean up my rocker cover. Noticed inside the bores that hold the rocker pins looks like Swiss cheese in a few places.
Is the cover scrap?

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CB500/550 / Re: CB500 k1 Primary shaft bearing spinning in case.
« on: September 07, 2025, 12:02:51 PM »
Thanks for all your replies.

I feel better now knowing Loctite make a product for this very problem.
The gap is very small indeed. Bearing will only slide in by hand once positioned perfectly.

Looks like Loctite 609 (up to 150 deg c) or 620 (232 deg c) will do the trick,, can’t find much info on suitability with oil though.

Will 620 be overkill? Not sure how hot these engines can get.

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CB500/550 / CB500 k1 Primary shaft bearing spinning in case.
« on: September 06, 2025, 11:12:39 AM »
Hoping somebody can help please…
 Should the primary shaft bearing that sits behind the oil pump be able to spin freely in the case? Just rebuilding the bottom end and concerned it’s not right.
In the correct position the bearing can just slide in and out of the casing easily.
Also looks as if the bearing on the other end of the primary shaft has also been spinning in case.

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