Honda-SOHC

Yes, the air filter.  I purchased a new "Pattern" one that said it was for a cb550K3.  Fitted it and the bike performance was worse.  Quite a bit worse.  So I put the old dirty one back in.  The old one must have been purchased a few years ago.
Here is a pic of the two.

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Maybe there are different type of filter depending on the carb type.....pd46aa or pd46ac

You got me confused... what carbs is this about: 069A? 627B? 022A? 087A? or PD carbs?

it says PD46A stamped on the side.  The same ones that were on the bike when I bought it new.

I did have these all apart 2 or 3 years ago.  It took a while to get them right back then.  It starts and idles fine and has a smooth getaway.  But starts to hesitate over 40+mph.  A change of air filter (new one) made it far worse.

I did put on a new set of 4 into 4 exhausts from DSS a while ago. 

The 22mm figure is an upside down  height from the carb body to the bottom of the float, , not the depth of petrol in the bowl.

That's my understanding.

Yes yr right.  I guess if all the floats were of the correct (22mm).  Then the fuel height would all be correct.....

Or stick a bit of clear tubing on the bottom of the carb and see what the fuel level actually is without having to take the carbs off (yet again).  And take apart.  I will try this to see if all 4 carbs are the same.  Which is a start.

Its a lovely looking bike but at that price would you ever use it?.  Its only worth what somebody will pay.

Go for 5ft lbs, I never torque these small bolts, always done by feel, hand tight then an eighth of a turn

yup, I think it must be 5 or 6 ft-ibs.
Clymer gives
6mm bolt, nut 6-9 ft-ibs
A cb500T manual gives
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And another manual? gives
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These bolts are internal to the engine, so once done they cannot be re-visited.

The Suzuki re5 engine rebuild seems to give torque settings for just about everything.  Small or large bolts.

Back then, nobody was thinking 50 years ahead.....

Do you have more detail in photos of the failed parts ?

Here are 3 more pics.  Nothing rotates or turns.  It all seems seized up.
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no 2
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and finally
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Still not replaced the wheel yet.... Do I drill or unscrew the centre part.

It gives the impression of lubrication failure.  But all the other wheels seem fine.
I have cleaned out the centrifugal oil filter.  It was not too bad.  Maybe I will simply re-build the top end.  I think it was factory finished and not been apart.
I did mean to add that a brand new did chain will be fitted.  I have not checked the old one.  At 12.k miles on the engine, I think it should still be service-able..... But I should check

 

Just thought I should post a pic of the offending bike.  I dident think I would need to pull the engine apart.  So there we go.  Its not a K0.
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I did actually get the top exhaust from dss. And the bottom one from Germany (I think).