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I have had three of this body style carburetor come through with this passage clogged




I have found that there is a small jet internally behind this ball seal



Getting to it was a destructive [process. Is there anyone who knows how to get to this jet to clean it NON destructively? I have soaked these things in degreaser in a heated ultrasonic cleaner for hours. I have soaked them in carburetor cleaner (both Chem Dip and carburetor cleaner sprayed out of a can) in the ultrasonic cleaner for hours. NOTHING breaks the gunk up so that I can get spray or air through it. Surely there HAS top be SOME way to clean these without having to replace the bodies!?

Any help, advice, tips or tricks would be GREATLY appreciated here! Thanks.

Normally that would be the bowl vent, but since that is a primer carb, and the bowl venting system is part of the primer system(angled hole on other side of carb on mounting flange, that hole needs to be plugged for the primer to work. So it is clogged on purpose.

ILENGINE said:

Normally that would be the bowl vent, but since that is a primer carb, and the bowl venting system is part of the primer system(angled hole on other side of carb on mounting flange, that hole needs to be plugged for the primer to work. So it is clogged on purpose.

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I typically don't disagree with people who probably know more than I, but... in this case, you're mistaken. For one, on every carburetor on which I've come across this, the new replacement carburetor bodies were NOT clogged or plugged. Second, with this clogged, the engines were running rich until I swapped bodies with ones whose jet were not clogged. Finally, as I said, I am aware of the jet behind that ball which was clogged - not plugged - because I removed that ball from one of the carburetors. I had basically destroyed the body trying to get it out, as I mentioned, but there IS a jet that was CLOGGED behind that ball.

IL is correct, that is the bowl vent, part of the primer system. The jet you are talking about is a metered air passage way.

Rivets said:

IL is correct, that is the bowl vent, part of the primer system. The jet you are talking about is a metered air passage way.

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OK... be that as it may... metered air passage way or jet... whatever its called.. it is clogged.

i always give it a generous high powered shot of carburetor cleaner after an ultrasonic bath and they come clean.
watch your face and eyes.

ILENGINE said:

Normally that would be the bowl vent, but since that is a primer carb, and the bowl venting system is part of the primer system(angled hole on other side of carb on mounting flange, that hole needs to be plugged for the primer to work. So it is clogged on purpose.

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Rivets said:

IL is correct, that is the bowl vent, part of the primer system. The jet you are talking about is a metered air passage way.

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I wanted to take a picture of what is behind that ball. THIS is what is getting clogged


Since this sits BEHIND that ball and in an elbow, there is NO WAY to push anything through it.

Scrubcadet10 said:

i always give it a generous high powered shot of carburetor cleaner after an ultrasonic bath and they come clean.
watch your face and eyes.

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For every other jet or "metered passage" that works great. I do the exact same thing on all of them (except the "watch your eyes part" ... I always forget to do that until it's already too late )but this one sits behind a ball that the factory pressed in after drilling the passages and since it's in an elbow... nothing is getting through it. Carb cleaner; Chem Dip; ultrasonic cleaning; 90 psi air pressure... nothing. I cannot believe that I am going to have to keep replacing these bodies because of one hidden "metered passage."

I've got some different size and type of needle tips (some tapered rubber and some are steel tipped that I can put on the end of my air nozzle and use high pressure air. Be sure and wear eye protection because if the clogg is on the opposite side of the ball, the ball during high pressure the ball might be blown out at high speed. I've used this method to clean out dried paint from small passages in spray guns after soaking them in acetone. Paint will come out like a small worm if constant pressure is held applied.
If this method does not give it relief I would probably take my Dremel grinder and I have some very fine sharp pointed bits similar to dental drills and carefully relieve around the ball for removal. I got some of the bits from a dentist (just ask for their dull root canal bits). I have to use a Dremel tool chuck adapter for their use. Re-sealing afterwards will require some thought. Them Walbro LM carbs are not cheap now days and some are NLA.

Just center drill (using a carbide bit) the steel and extract it. Of course the next steel ball will need to used to replace it. I have done several on the horizonal engine tank mounted carburetor where the tower become clogged with rust.

StarTech said:

Just center drill (using a carbide bit) the steel and extract it. Of course the next steel ball will need to used to replace it. I have done several on the horizonal engine tank mounted carburetor where the tower become clogged with rust.

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Good Lord. I have hard enough time trying to center a drill bit on a flat surface, much less a round ball! lol... I'll try it, though. Thanks!

Maybe take a dremel tool and put a divet or grind a flat spot.

Probably have to go really slow with a sharp bit so as to not grab and spin the ball. I would rig a drill stop on the press or the bit. Might not have to drill all the way through the ball???????????
Might have to lever it out though if not some relief on the a side after drilling.

Might use an old LM body as a depth gauge setting????
Post up a picture of your mutilated ruined LM carb body?

shadetree#1 said:

Maybe take a dremel tool and put a divet or grind a flat spot.

Probably have to go really slow with a sharp bit so as to not grab and spin the ball. I would rig a drill stop on the press or the bit. Might not have to drill all the way through the ball???????????
Might have to lever it out though if not some relief on the a side after drilling.

Might use an old LM body as a depth gauge setting????
Post up a picture of your mutilated ruined LM carb body?

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I posted this - https://www.lawnmowerforum.com/thre...albro-lm-series-carburetors.71610/post-447161 but would you like a less close up?

rebeltaz said:

I posted this - https://www.lawnmowerforum.com/thre...albro-lm-series-carburetors.71610/post-447161 but would you like a less close up?

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Did not realize that pic view was from the outside where the ball was removed because I seen other holes exposed. Is that the whole side or the carb at the ball area ground off of the drilled/cast channel or ?????

shadetree#1 said:

Did not realize that pic view was from the outside where the ball was removed because I seen other holes exposed. Is that the whole side or the carb at the ball area ground off of the drilled/cast channel or ?????

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lol.. here's a not so close-up view

That not even the same carburetor as the OP posted a picture of Primer version and the one he is discussing is a choke version. We need to be looking and comparing apples to apples and not oranges to apples. Now if the OP can post the part number of the one in the last picture then some can do a little research on our end.

StarTech said:

That not even carburetor as the OP posted a picture of Primer version and the one he is discussing is a choke version. We need to be looking and comparing apples to apples and not oranges to apples. Now if the OP can post the part number of the one in the last picture then some can do a little research on our end.

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Definitely need more information. That style of carb was available in primer and choke versions and with and without idle circuit. throw in the fixed versus the adjustable carbs in the mix. And can't forget the universal carb that was manufactured to be either a primer or choke carb.

StarTech said:

That not even the same carburetor as the OP posted a picture of Primer version and the one he is discussing is a choke version. We need to be looking and comparing apples to apples and not oranges to apples. Now if the OP can post the part number of the one in the last picture then some can do a little research on our end.

Click to expand...

ILENGINE said:

Definitely need more information. That style of carb was available in primer and choke versions and with and without idle circuit. throw in the fixed versus the adjustable carbs in the mix. And can't forget the universal carb that was manufactured to be either a primer or choke carb.

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OK... I'm sorry for the confusion. I am the OP and I posted all of the pictures. The carburetors I am having trouble with are BOTH styles. The picture I posted last is just the one that I actually removed the ball from.

The part number for this carburetor is 591925

Okay then this carburetor has an idle speed jet that mixture the air bleed with fuel for idle mixture. This would nearly impossible to clean something solid in from the nozzle tube. What you see is probably the out flow side. The nozzle itself is press in and not removable.


Also this carburetor is use only on five models.