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Old 24-08-12, 03:08 AM   #1
18sv650
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Default Yamaha fzs carburetor pilot jet broken

Hi, I was attempting to clean a friends carburetor and just as i started i was turning the pilot jet clockwise to see how many turns it is before its tight, however i think it was tight already and with a bit of force it snapped.

Is this carb no use no as i dont see a way to remove the broken bit without ruining the threads, Or should i just leave it as it is and not make things worst? Please help
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Last edited by 18sv650; 24-08-12 at 03:09 AM.
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Old 26-08-12, 11:22 AM   #2
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Default Re: Yamaha fzs carburetor pilot jet broken

That's not the adjustable part, which is a screw accessible from outside the carb not in float bowl, that's the jet itself, which will have been fitted into the carb body tight, not at a backed out setting like the screw is.

It may be possible to have it removed by someone suitably equipped, a bike shop or an engineering workshop of some sort perhaps. Don't go hacking at it, it may well be redeemable and just the jet itself that's broken, so get it to someone who can help - carb bodies are made of a very soft material and the likelyhood of wrecking the carb is high.
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Old 26-08-12, 05:22 PM   #3
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Default Re: Yamaha fzs carburetor pilot jet broken

If I was presented with it, I would consider 2 options.
1 - get the broken part out and fit a new one (proper fix)
2 - modify the broken part with a sleeve made specially to make it an interference fit in the carb body and press it back in the hole (this is a bodge, depends on what bike it is for really)

As Sid says, it needs looking at by "someone who can". If it can be got out easily, then it's a relatively cheap fix, if it can't it could get more expensive to do, replacement carb could be the solution if you find a cheap one.

Sometimes things like that will come out easily with a tapered square pin gently tapped into the hole, loosened so it isn't wedging it tight, then used as a "key" to unwind it. Problems start when this doesn't work and you have a mangled broken piece firmly fixed in place. Heat will usually help (hot air or boiling water, avoid flames). Very careful drilling is an option but needs setting up on a machine to do it. Drill out the core and then the thread can be picked out. Time consuming either way.
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