Fast Idle Screw O-Ring

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Fast Idle Screw O-Ring

Postby Two Tone Blue » Wed May 20, 2009 11:29 am

Hi guys,
I am rebuilding my carbs after a full strip down & in the gasket set is an o ring I didn't recognise.

I have looked on a parts diagram & I think it comes from the fast idle screw but there is another part there which looks like a washer which I don't recognise either.

All that came out when I stripped it were the screw itself which steps down in diameter three times into a needle & a spring.

On the diagram it looks like there is a washer & an O-Ring. I presume the washer is to protect the O-Ring from the spring so the order of assembly would be O-Ring in first then washer then spring then screw/needle.

Can anyone tell me if this is correct please?

Also, as mine are presumably still in there should I leave them alone bearing in mind that the carbs have been ultra sonicly cleaned which as far as I know is not good for rubber?

If I should remove them & switch the O-Ring then how do I get the damn things out & is there any risk to the washer i.e. is it metal & how sturdy is it?

Any help is appreciated.
CX500 CB UK '81
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Re: Fast Idle Screw O-Ring

Postby Gman » Wed May 20, 2009 9:06 pm

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Re: Fast Idle Screw O-Ring

Postby Two Tone Blue » Thu May 21, 2009 5:17 pm

Thanks Shep,

My model is shown on csmnl & the Honda workshop manual as having a washer & o-ring on the end.

I've spent a while examining & picking at the bottom of the shaft & the more I look the more I'm convinced there's nothing left in there.

Do you think ultra sonic cleaning would have dislodged them if they were left in? They may have come out in the tank & been lost as I'm fairly sure the shaft is empty now.
CX500 CB UK '81
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Posts: 16
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Location: Brighton UK

Re: Fast Idle Screw O-Ring

Postby Gman » Thu May 21, 2009 10:29 pm

Two Tone Blue wrote:Do you think ultra sonic cleaning would have dislodged them if they were left in? They may have come out in the tank & been lost as I'm fairly sure the shaft is empty now.


Could well have.If you are happy then just use the new ones.If there is a problem then at least you know one area to re-check but you sound good-to-go :)
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