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Discussion Starter #1
as title says, cleaning mc19 carbies and the needles have some hard green stuff coated on the ends of them. Is that supposed to be there???
 

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If I had to guess, I would say it was the product of some corrosion going on. Needles are usually brass, which is partly made of copper. Copper oxide (as a result of corrosion) is green.

I might be wrong - I'm sure Drew can correct me :shy:
 

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needles in the mc22 are stainless or something, but the jets are brass so maybe from there, but I think needles are supposed to be clean.
 

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Discussion Starter #4
well i have been tryng to get this bike working for a while with no luck. I scrubbed the green stuff off the needles and fucking started first go!

sweet relief! this was my $500 bike :)
 

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banana.logic said:
nice one, I wouldn't have thought the needles would have affected starting though...
Well considering the only needles you get in Carbys are idle mixture Screws (needles). Then it would make a huge difference.

Also check that the little holes in the emulsion tubes are clean as well. And the main jets located at a port from the float bowl.
 

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They were kawasaki parts :D
 

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I was thinking of the needle attached the the slide...

I thought that was called a needle jet, and the idle mixture was the mixture screw?
 

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ASTAR said:
banana.logic said:
nice one, I wouldn't have thought the needles would have affected starting though...
Well considering the only needles you get in Carbys are idle mixture Screws (needles). Then it would make a huge difference.

Also check that the little holes in the emulsion tubes are clean as well. And the main jets located at a port from the float bowl.
i think you need to brush up carb basics 101

idle mixture screw is not a needle

needle is in the middle of the carb in the centre of the slide

and yes any crud on that is going to cause greif as the needle works in the bottome end so will affect starting and low throttle
 

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johnnie, the idle mixture screw does have a needle on the end which can be adjusted by screwing it in and out, this may be what astar was referring to... but as per my above post, I wouldn't call it a needle.

Edti: spelling.
 

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girly said:
If I had to guess, I would say it was the product of some corrosion going on. Needles are usually brass, which is partly made of copper. Copper oxide (as a result of corrosion) is green.

I might be wrong - I'm sure Drew can correct me :shy:
+1














:p
 

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banana.logic said:
johnnie, the idle mixture screw does have a needle on the end which can be adjusted by screwing it in and out, this may be what astar was referring to... but as per my above post, I wouldn't call it a needle.

Edti: spelling.
well the reference was to this bit

ASTAR said:
Well considering the only needles you get in Carbys are idle mixture Screws (needles).
 

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So Carb 101 for me then. So guys are you going to teach me such things? :hail:

I suppose I was wrong with the only needle in this particular carby. But Idle mixture screws generally are a needle and the term "screw" is the adjustment method used on them.

Older carbies used to have these two components seperate - but in the last 15 years they have combined them as one unit. But for me being in the automotive business for 15 years - I guess I'm still old school with some of these terms.

My topic was only based on the idle mixture Screw(needle) - and nothing else.

So how was my reference wrong?
 

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Lane said:
The needles on the cbr are aluminium.
The jets are brass, copper is in brass, copper corrodes green... or black... but in this case probably green if the bikes been sitting for a while.
 

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Drew said:
Lane said:
The needles on the cbr are aluminium.
The jets are brass, copper is in brass, copper corrodes green... or black... but in this case probably green if the bikes been sitting for a while.
Yes mate, i was just correcting someone's post earlier regarding the needles being stainless.
 

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Drew said:
Lane said:
The needles on the cbr are aluminium.
The jets are brass, copper is in brass, copper corrodes green... or black... but in this case probably green if the bikes been sitting for a while.
and yellow, brown and red :) depending on particle size and the oxide type formed.
 

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jlyall said:
Drew said:
Lane said:
The needles on the cbr are aluminium.
The jets are brass, copper is in brass, copper corrodes green... or black... but in this case probably green if the bikes been sitting for a while.
and yellow, brown and red :) depending on particle size and the oxide type formed.
Green was the colour mentioned though, so other colours aren't awesomely relevant, are they?
Also, it could be a fuel colourant.
 
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