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LanceR75 10-31-2012 10:29 AM

Jet Stuck in Carb
 
Man, this left carb is grungy! I've gotten it torn apart but one of the jets is stuck and I've half stripped the flat head screw trying to get it out. Should I try soaking it in something or will I have to drill it out?

Cheers!

oldroadie 10-31-2012 10:31 AM

I've had pretty good success on other stuck fasteners with a 50-50 mix of acetone and ATF and soaking for a good while.

Airhead Wrangler 10-31-2012 10:34 AM

Quote:

Originally Posted by oldroadie (Post 19940047)
I've had pretty good success on other stuck fasteners with a 50-50 mix of acetone and ATF and soaking for a good while.

that or try some heat on it.

Cordless 10-31-2012 10:45 AM

Use an impact driver instead of screwdriver--even if all you do is twist the impact drive instead of striking it. If just twisting it doesn't free it, strike it gently with a heavy hammer.

I have had good luck with Kroil for loosening.

LanceR75 10-31-2012 10:48 AM

Quote:

Originally Posted by Cordless (Post 19940148)
Use an impact driver instead of screwdriver--even if all you do is twist the impact drive instead of striking it. If just twisting it doesn't free it, strike it gentlywith a heavfy hammer.

I have had good luck with Kroil for loosening.

I actually did try tapping the outer housing to loosen it and successfully bent the housing so, now I get to fix that as well.

JonnyCash 10-31-2012 10:49 AM

I'd try gentle heat. A heat gun, or boil it for a bit. Aluminum expands quite a bit when heated, more than most anything else, which will loosen things up. Be patient, and don't lose your cool.

bmwhacker 10-31-2012 06:40 PM

+1 on the heat gun.
I use one to warm up pistons...."sticky" wrist pins slide right in / out with a little expansion of the aluminum.

mfp4073 10-31-2012 06:54 PM

I ended up drilling it a little and using an extractor on it. Was in JUST the same place and freaking out about having to replace a carb

Wirespokes 10-31-2012 06:58 PM

If you're applying enough force to bugger the threads, you're over-doing it!

Be patient. That's the very first ingredient.

Give the penetrating oil time to ... uh ... penetrate.

Heating and cooling cycles make it easier for the oil to penetrate and breaks the bond between the jet and aluminum body.

Go back and forth - tighten, loosen, but don't ever use enough force to bugger the screw head! I know, it seems weird to try to tighten it, and it seems counter intuitive, but it is one of the successful techniques.

I wouldn't suggest tapping on the screw or the body - they're both way too soft!!!

Another thing that's worked for me is aluminum cleaner. I always used to use a Zep product for cleaning aluminum but I can't get it any more. The next best is Eagle1 mag wheel cleaner. Don't get the one safe for clear coated wheels - it's not as strong!

Work on it a little at a time. Say ten or fifteen minutes, and just leave it if the jet hasn't budged yet. I've been able to salvage slide carbs like the Dellortos, with stuck slides and chokes this way. So be patient, it will free up!

Bill Harris 11-01-2012 03:49 AM

My experience is that the float bowl will get a dab of water-- from rain, washing or the tank-- and this can wick up into the jet threads, and if the bike is left sitting for a long time the water will corrode (oxidize) the carb pot metal (a zinc-aluminum alloy) and lock the jet in. As Wirespokes says, penetrating oil, heat cycling and when the jet starts to move, turn it back and forth as the corrosion bond breaks down.

Tricky, but do-able if you're careful. Brute force usually results in a cha-ching sound emanating from the wallet.

--Bill

ragtoplvr 11-01-2012 03:55 AM

learn to hollow grind a flat blade screwdriver, it makes a huge difference in holding power. Then a dab of valve grinding compound on the blade, the amount of force you can apply goes way up. Then heat the body in boiling water for about 10 minutes. They always come out for me so far.

Rod

US_Marshall 11-01-2012 04:23 AM

My left side idle jet was stuck, half of the head was already missing when I started on it. I ended up drilling it out on a mill, even after removing all but the threads, the corrosion was so bad it still would not come out. I ended up breaking the brass threads out with a small pick. Minimal damage to the body but a new jet screwed in and tightened down.

bmweuro 11-01-2012 09:55 AM

Quote:

Originally Posted by Cordless (Post 19940148)
Use an impact driver instead of screwdriver--even if all you do is twist the impact drive instead of striking it. If just twisting it doesn't free it, strike it gently with a heavy hammer.

I have had good luck with Kroil for loosening.

Quote:

Originally Posted by LanceR75 (Post 19940175)
I actually did try tapping the outer housing to loosen it and successfully bent the housing so, now I get to fix that as well.

I agree with Cordless. I rebuild these carbs all the time and an impact used as mentioned or a 1/4 drive racket with a slotted screw driver socket works good to. There was no suggestion by Cordless to tap on the housing. Be very careful trying to fix it. You could crack the housing. If it is still useable leave it.

Foot dragger 11-01-2012 09:59 AM

Quote:

Originally Posted by LanceR75 (Post 19940175)
I actually did try tapping the outer housing to loosen it and successfully bent the housing so, now I get to fix that as well.

Sounds like new carb time,its all a learning process.

disston 11-01-2012 11:32 AM

If you bent the housing you will probably have to post some pictures so we can see the damage. This is not good.

Start with, just which jet was stuck? Or is it still stuck? The idle or the main jet? It sounded to me like the idle jet because you said you were using a screw driver.

Then again the idles mix screw is made of steel and this may be more prone to being stuck. But all of the jets can be stuck at different times.

Going slow, not hurrying. Using Heat and a good corrosion attacker, Kroil is the best in my book but there are others.


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