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cb550K3 carbs

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nairb:
So.... a part of the resurrection of my K3 was the refurb of the carbs.They are the originals.  So I took them mostly apart and cleaned up.  Then back together.  I made a jig to hold them and did a static fuel test........ They flooded.

Anyway after a bit of effort and re-setting the carbs up they would sit on the end of the fuel line from the tank and not flood or leak.  Which was all very pleasing.

So I put them on the bike and connected up the cables and air box.  It initially ran ok, no flooding but the idle and balance was a bit off.

Some 10 days later I get around to checking for air leaks on the carb rubbers etc.  Except now the carbs flood again.  Well one of them is - the lhs one.  Which is a pain.

My question is..... These are the old original carb floats.  Do they fail with age??.  I am thinking that they have sat there for nearly 2 weeks fueled up.  Do they go porous with age and now dont "float" as well when left in fuel.

I think its the last issue to fix before going for the mot. Its a long time since its been on the road so its still not registered as 'historic'

Ta
Nairb

Bryanj:
No they dont its just pd carbs are a pain in the wottsit

JezzaPeach:
With the 500/4 I can get the float bowls off using a mini ratchet with a JIS or Philips screwdriver tip.
If you can do that it might be worth checking the float has no fuel in it and if not, using a carb kit brush to give the float valve hole a good scrub. Maybe leave some vinegar in it to dissolve possible traces of oxide type deposits.

Bryanj:
2 most common things on pd carbs are
1 pilot jets/pathways blocked, the jets are push in but will come out
2 pilot screws with missing tiny washers and O rings along with people who tighten them in too much and deform or break the tip

michtag:

--- Quote from: Bryanj on August 18, 2020, 02:16:12 PM ---2 most common things on pd carbs are
1 pilot jets/pathways blocked, the jets are push in but will come out
2 pilot screws with missing tiny washers and O rings along with people who tighten them in too much and deform or break the tip

--- End quote ---

Speaking of o-rings, can anyone tell me their dimension? I'd like to have a few spare ones and don't really want to buy a full carb kit.
Also, would a broken/missing o-ring cause erratic idling?
cheers

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