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What's my next move - #3 plug STILL BLACK !!

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Good lesson to be learned here (don't let me near your carbs).
Rather the opposite: you've got so much carb-fiddling experience that you may well become the next carbie guru. ;)

Interesting... as they're brass I never thought it possible they could corrode & cause a problem like that!
Yes, it's surprising when you come across it for the first time. I had a plug-fouling problem on my Kat1100, turned out that one of the jet needles was pitted and corroded all down one side. Why would one needle corrode but not the others, hmm? One of life's little mysteries.
 
Had the same problem with a GS1000E with CV carbs. All the idnicators were towards a blocked jet inside the carbs which were cleaned twice and heading for a third strip down.

Tunred out to be the plug cap on that cylinder was breaking down.

Suzuki mad
 
...turned out that one of the jet needles was pitted and corroded all down one side. Why would one needle corrode but not the others, hmm? One of life's little mysteries.

I would guess that one jet needle was made from a different material, or in a different material condition, or anodized differently perhaps??

My jet needles appear to be anodized aluminum - who knows if they are all the same??

BTW - I will never be a carb guru, but I'm sure learning a bunch-o-stuff tearing them apart!!

mike
 
Pics of bad needle jet

Pics of bad needle jet

As promised, here's a pic showing the ID corrosion/cavitation on a "cut-open" naughty needle jet. This thing caused me LOTS of anguish...
 
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Pics of bad needle jet

Pics of bad needle jet

Another pic showing close-up corosion adjacent to a cross hole - fuel was just seeping around the jet needle...
 
Pics of bad needle jet

Pics of bad needle jet

Last pic showing corrosion into ID sidewall - measures approx. .005" deep...
 
I've never seen one that corroded. That's terrible!

Hey Bill,

Yeah, looked awful - no wonder I couldn't keep that carb from running rich!

Guess that's what happens to carbs that sit with solvent (e.g., old gas) in them for 15 years...

Gotta tell ya, the new needle jets sure make this old bike run smooth - no more stumbling either.

regards,

mike
 
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