How To Clean / Rebuild Opposed Twin Briggs Carburetors / Junk Engine Running!!!

Saved this engine from going to junk, needed a little work to get running, after finding alot of parts were missing, but it runs good and doesn't smoke any! Thanks for Watching!!!

[@garryludwick2990]

GREAT VIDEO!!!!. Little hint on the fuel pump. When replacing diaphragm while on engine, use Vaseline on springs to hold in place. The fuel will wash it off. Just helps hold then while assembly on the engine

[@andrew4403]

The four bolt fuel pump is a Niki carburetor. The three bolt is a Wahlberg carburetor.

[@ededmund5685]

good video thx Ed Loretto Ontario Canada

[@benkalinowski5834]

Sweet

[@fnaguitarplayer9]

Thanks for Watching!!!

[@silviorusso2717]

I have one it needs exhaust.i don't want to pay 200 dollars

[@fnaguitarplayer9]

You can use 2 3/4" mufflers (and pipe to route them out), just the standard thread in type like you would see on older 5 and 8 hp briggs engines, i have another video on that setup as well. Thanks for Watching!!!

[@garryludwick2990]

Noticed you only put one small spring in the fuel pump, the one on the body and not on the valve plate. Sorry. Just been dealing with it myself.

[@zachsgarage4714]

The 3 bolt fuel pump is a walbro carburetor, and the 4 bolt fuel pump is a Nikki carburetor.

[@fnaguitarplayer9]

I hear ya, i didn't pay attention that this was a walbro, but your right. They are very similar though. Thanks for Watching!!!

[@jafinch78]

Interesting, I started working on the three machines I figured I'd re-learn plus small engine repair with riding lawn mowers with; Snapper with 280000 series, Poulan Pro with 31000 series and a Murray with a 422000 series (like in this video). I didn't realize the L-Head Opposed Twins have their own style Walbro and Nikki carbs. Have a Yard Man V-Twin I have to pay for and pick up later this week that is a 22HP which will be a new design to learn with also... though sounds like that engine is OK and runs. Neat watching and reading into. So far I have the Poulan Pro system up and running and made some KZbin videos on my channel since I figured I'd share since others shared to show how to also. I've been documenting all the work on my Facebook also more-so: facebook.com/james.analytic Thanks for sharing!

[@tudocervera3764]

fuel pump diaphram requires 2 springs.. but awesome video.. thank you sir..

[@fnaguitarplayer9]

hmm must of missed that! Thanks for Watching!!!

[@watermanone7567]

Nice job. I got a Murray mower with the same opposed twin 14.5 hp rider mower last year that the guy was going to junk. Did the same carb overhall you are doing. Ran great, new blades and belt. Gave it to my daughter. She loves it. I think that was one of the best engines that Briggs ever made. Thanks for the video's.

[@fnaguitarplayer9]

Thanks. I hear ya! They are great engines, plenty of power and sound good too. One of my main mowers has a 14hp oppy on it, 38 inch cut, plenty of power. Your welcome, Thanks for Watching!!!

[@rverro8478]

I wonder why, a good engine like that, was about to be discarded ? Thank you Frank, for taking the time to explain everything. Peace !

[@fnaguitarplayer9]

Don't know. glad to get it though, it will be a good backup for one of my mowers if i ever need it! I was expecting it to smoke like a freight train since it was basically being parted out but nope.Your welcome! Thanks for Watching!!!

[@greenmachine55]

I have a governor adjustment control speed setup similar to this but mine being the same carb but with the 4 screw set up and im wondering if its possible to competely remove and replace that whole setup cause i know you can probably replace the springs but i think the whole governor speed adjustment setup might be getting worn out and needs the whole thing replaced and adjusted

[@BoomstickAsh]

Thanks for posting this video! I was having some trouble with my 16.5 hp B&S and your breakdown of the carb helped me do some quality trouble shooting.

[@fnaguitarplayer9]

Your welcome! Glad to help out! Thanks for Watching!!!

[@wildefox1478]

Great video, that's great that you saved that engine from going to the scrapyard, it's a good runner and sounds good! I have a 1965 Briggs 4HP horizontal and another later model 4HP that a buddy of mine gave me that he rescued from the scrapyard, I just completely rebuilt the 1965 engine. Keep up the good work!

[@fnaguitarplayer9]

Thanks! Yep, I was surprised it didn't smoke any since someone took parts off it. I hear ya! I love those side shaft engines, I love the 5hps. Thanks for Watching!!!

[@alejandroalexis9531]

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[@cassiusjimmy658]

@Alejandro Alexis Instablaster ;)

[@alejandroalexis9531]

@Cassius Jimmy I really appreciate your reply. I found the site on google and im waiting for the hacking stuff now. I see it takes quite some time so I will get back to you later when my account password hopefully is recovered.

[@alejandroalexis9531]

@Cassius Jimmy It worked and I finally got access to my account again. I'm so happy:D Thanks so much you saved my ass :D

[@thornbush17]

Ty....i had hoses wrong and it was driving me crazy why i was not getting gas.....ty again

[@spark23ca]

i'm going to ask a seriously dumb question. But i don't know so here goes ..i got a 3 bolt fuel pump carb like this..the low speed jet on the front bottom of the carb is a fixed jet...it just screws in and out and it holes in the middle but you can't get any air threw it .ive took it out and cleaned it with a super small wire ..but it won't got all the way threw ..

[@outboardfixer]

You didn't put the other spring in the fuel pump...there are TWO small springs that go in that fuel pump. When you get a kit there are TWO springs...one where you put it and one goes on a little post on the plastic block to run the other little diaphragm flap. You need to put a little grease on it to hold it while you put the plastic center piece in place.

[@dougsanders6034]

Thanks for the vidio! The carb with 4 bolts in the fuel pump is a Nikki. The one with 3 bolts is a walbro.

[@answerace]

Great video! I'm about to tear one of these apart for the first time. Are there any springs on the throttle linkage that is on the side of the carb?

[@danharold3087]

My favorite lawn tractor is a Murray with a Briggs opposed twin. Today I scored an old GT with a Briggs oppy. I’m still smiling. It’s been sitting a long time, engine may be locked. Original owner said it ran when parked. That sort of thing. Looking forward to playing with it. Thanks for the video.

[@fnaguitarplayer9]

I heard that! They are great engines, i could listen to one idle all day long haha Sounds interesting! your welcome, Thanks for Watching!!!

[@bstarnes514]

Hahaha I know the feeling! I scored a sweet deal just the other day. I got 2 yardmachines, one with a 20hp opposed and the other has a 18hp intek single. I also got a Murray widebody LT with 12.5 single and another murray rear engine rider with chain drive. I got all this for free! My wife said I've been smiling in my sleep lol

[@danharold3087]

bstarnes514 @bstames514. ....and where’s the video LOL

[@Jim-ie6uf]

Nice job and well done video. I like the trick with the jet and spring.

[@fnaguitarplayer9]

Thanks! Kind of surprised my self that it actually worked haha Thanks for Watching!!!

[@lewiemcneely9143]

The best thing I did for mine was get a fully adjustable carb. The factory job was jetted way too lean and it had to be choked all the time. Not the adjustable. It will just putter along. That engine sounds fine! No junker there. My starter has been rough ever since I got it 2 years ago so I thought I'd check it out before the grass got cranked up so I was going to pull it out in the sun where I could see what's what and when I tried to start it, it STRIPPED totally out. Good timing. I had to go get a puller because with my hands bad I'd never get the inside starter bolt and a BARELY got the flywheel off with the puller. The pry bar and 3# hammer method didn't work. Finally got a gear at ACE but ordered 2 online with a 10 pack of 'C' clips so now I'm set. New gear sounds smooth as a car. And I broke the nipple off the plastic carb block when I rebuilt the carb before I got the adjustable. They've got them online too. Guess you pulled the dipstick tube when the shroud was off. Folks do strange stuff. Now I'm ready to mow and even cleaned and painted the mag and flywheel. You can have that wretched factory carb if you want it. I don't! I really ;like these motors and you did GOOD! Pick me 1!

[@fnaguitarplayer9]

I hear ya, i hate that. I like some adjustment. I hear ya, its a pain pulling flywheels, sometimes they stick big time. Yeah, i looked inside and could find it, i figure it would be making noise if it was inside, i borrowed one from another engine to check the oil in it haha I love to hear them run! Thanks for Watching!!!

[@lewiemcneely9143]

@@fnaguitarplayer9 You did good! Pick me one!

[@michaelfornell4467]

Thanks guy. I really needed to watch this.

[@robertcobb8760]

that's exactly what is wrong with my engine thanks for the tip

[@gary96397]

A couple of dollars for it..these engines cost £250 in the uk

[@jojojeep1]

I think you and I are the only people on planet earth that owned a twin opposed with no bearing noise ha ha ha

[@mikesnowden1312]

What’s the difference between the 3 bolt and 4 bolt carbs. If a man bought an aftermarket carb that had the 4 bolts on the pump instead of the 3 bolts would run the same

[@fnaguitarplayer9]

Just design, they both work the same. Fuel flow should be identical i would think, the gaskets/diaphragms are the same size just different holes. Thanks for Watching!!!

[@timd5597]

How many turns out do you set adjustable jet?

[@andrew4403]

The carburetor with the 4 bolt's for your

[@GaryT1952]

Great job as usual! You always seem to be able to make chicken salad out of you know what! 👍

[@fnaguitarplayer9]

Thanks! haha thats funny! Thanks for Watching!!!

[@turenordstrom6144]

Excellent tutorial!

[@timkis64]

i love my opposed twins, 1986 16 horse mowed in summer & plowed the driveway in winter for 30 years.my 1995 19 horse runs ok, but hard to start.i got to adjust the valves this winter.their far enough out, the cranking speed compression release no longer works properly.dont want to spin over with full compression.if you change the oil every year & keep clean fuel & air filters on them they will run many, MANY years.neither my 86 or 95 burn oil.original rings on both.

[@calholli]

Mine is real intermittent, and I don't know why... I bought a new coil for it, now the spark is good. I've changed that 3 bolt pump kit more than once. I don't understand it... Once I get it running, it works fine for the day... then it will randomly not start, even If I pour gas down it?? I'm pulling my hair out at this point, this has gone on for a couple summers now. Everytime I have to mow, I'm rebuilding the carb and trouble shooting everything-- and I never actaully figure out the issue... it just all the sudden starts? I don't have any kill switches hooked up or anything.... Spark looks good. I sometimes I'll have it running, and if I lower to about mid throttle, all the sudden it bogs and dies... and I can't get it to start again... almost like the governor kicked the throttle all the way down and it stalled?? and after that I can't get it to start again.. almost like a compression release is stuck or something. Its driving me crazy because I fix this type of stuff all the time, but this thing has got me scratching my head. any insight at all would be great. is there not a better carb setup for these? other than the 3 or 4 bolt carbs with the pumps? I don't like those little pumps, they're so problematic.

[@rayburnett3066]

A face shield works too

[@lewishawks2258]

Do you have a video on a four one

[@0x00zero]

probably lost the check spring in the plastic pump body unless it was somehow stuck in there (grease or slightly deformed spring).

[@silviorusso2717]

Your missing a spring

[@Mike-su8si]

I'll be cleaning my original carburetor that has the 3 screw fuel pump on the carburetor and ordering new pump pieces for it its been missing so i won't need the carburetor but it'll already be ready incase i might need to use it

[@joesphbaumgardner4579]

Great vid.... Glad to see a full breakdown on this engine and carb. Also in slow terms vs a speed vid with junk effects and music. I need some input and help on a matter. First, I have the 4 screw pump. I'm playing hell finding the part number for the guts inside the pump. I need to rebuild it. Anyone know that part number? Carb is # 69281. Next, I am in the stage of cleaning carb and forgot the line hook up. Meaning hoses and fuel line. On my carb there is 1 line to go to pump. On the carb is 1 brass copper hook up on side. One hose is short going to carb other is fuel line. Where does fuel line go on carb? pump or carb side.

[@fnaguitarplayer9]

Thanks! Ok, the complete carb kit for that should be 693503 if its made after 98, just the fuel pump parts (4 bolt) are 693502. Thanks for Watching!!!

[@tomgonyer970]

could you show how the linkage is adjusted unable to fine tune with the different linkages. Thanks Tom

[@adrianmcelhinney3756]

loved watching this video, learned alot !!! Thank you very much

[@petercurrie3875]

I have an old Sear's Craftsman 18HP lawn tractor with the exact same engine and carb. I'm having an issue with it not getting enough gas upon start-up after it's sat for a while. Been taking the air cleaner off and pouring some gas into the carb to get it stated. Once it fires up it runs perfectly fine. Changed the fuel line filter but still having the same problem. Any ideas???

[@fnaguitarplayer9]

This one doese the exact same thing, if it sits for more than a few days it takes i'd say 10 seconds of cranking. It did help after I rebuilt the carburetor this last time, the fuel pump diaphragm was stretched some. I also put a fuel valve on it thinking maybe it was siphoning out of the carburetor somehow, but it didn't help it. Also check the fuel filter if its clogged it will slow the fuel down getting to it. Thanks for Watching!!!

[@sundelius]

I currently can't get my 19.5 to run. Only with a blast of starting fluid down the carb. Fuel up to the pump but doesn't get to carb. Was rebuilt 2 years ago.

[@robertmailhos8159]

I have 2 twins 1 is a 18.5 I/c the other is a 19.5 I/c one question is what .is the most horse power that they made in those engine,s ps love the way they sound yeah buddy

[@fnaguitarplayer9]

As far as I know they ranged from 12Hp to 20Hp, at least thats all i ever seen. They do sound great! I did a video on a custom dual exhaust setup on one, check this out: kzbin.info/www/bejne/hqjGkoVooL2ambs It was interesting! Thanks for Watching!!!

[@r.w.3339]

I enjoyed that, just a real nice job getting it running pretty darn smooth on very a few bad parts but a lot of very good knowledge and experience.!

[@fnaguitarplayer9]

Appreciate that! Thanks for Watching!!!

[@ihus9950]

Good job, and great idea with the temporary jet. Should be a great running engine with new Carb kit👍

[@fnaguitarplayer9]

Thanks, yeah it was just a temp fix, but it actually worked haha Thanks for Watching!!!

[@Nesmaniac]

I took the carb off 1992 18 HP 422707 with the 3 bolt fuel pump like this. today. Mower worked fine last time I used it couple weeks ago but now it would not start. It was surging pretty bad last season and I'd have to run it with choke open a bit. I'm thinking it the main jet dirty but not sure I tried adjusting the float first and still would not start. What's the best thing to clean the carb with while I have it apart that won't damage the old gaskets in case I want to use them since they seem ok? Do I just need carb cleaner to clean it good and wipe it out best I can? Thanks. Great video and these machines are the best imo because I've cut with the 46" MTD garden tractor for 27 years and nothing major has went wrong and I cut like 3 acres. Got Troy Bilt big red horse and have 230 hours on it an rearend is about to go out it clanks when it gets hot and now seems to be struggling a bit to pull. Got it in about 2006 and it's 50" cut but not been the mower that the MTD has been. Not half the mower actually.

[@fnaguitarplayer9]

It does sound like it needs cleaned out good, and yes i use carb cleaner but it will swell out gaskets and diaphragms, i recommend picking up a rebuild kit for it that way you can change all the gaskets and parts in it. They are great engines, i love them! Thanks for Watching!!!

[@Nesmaniac]

@@fnaguitarplayer9 I cleaned it all out good with carb cleaner and used original gaskets and small copper phone wire and brush bristles in jets and happy to say it's working great again. 27 year old gaskets surprise me they still good and the fuel diaphram as well. Just don't make stuff like they use to I guess is the truth. Thanks.

[@fnaguitarplayer9]

@@Nesmaniac Glad to hear its going good! Most of the time the gasket will tear. you got lucky! Your welcome!

[@ThePheonix2009]

Thanks for the video. I am in the process of working on a motor with a carb like that one. Good to see what is inside of it.

[@fnaguitarplayer9]

Your welcome! Glad to help out! Thanks for Watching!!!

[@tbah9402]

The 19hp 3bolt carb are super rare only seen one in real life all others are the 18hp but the 19hp 3bolt i/c is rare

[@fnaguitarplayer9]

Didn't know they were rare! Now to be fair, this carb may have been changed out, it was found in a junk pile so its hard to say, but who knows it may be the original, lets hope it is! Thanks for Watching!!!

[@tbah9402]

@@fnaguitarplayer9 look at the part number it will tell you

[@tmurray3347]

I have a 12.5 horse with that carb

[@MrGjcruz]

Oppys are are some of my first engine repairs.

[@fnaguitarplayer9]

I hear ya! I started out on the little 5hp horizontal briggs. Thanks for Watching!!!

[@jerryt8116]

That spark plug wire was arcing.

[@fnaguitarplayer9]

That was a old coil I had, the engine was missing the coil so it was just used to get it running. Thanks for Watching!!!

[@roscopcoldtrain8849]

Is there suppose to have 2 small spring in the fuel pump

[@fnaguitarplayer9]

Yeah i must of missed that when i tore it apart! Thanks for Watching!!!

[@roscopcoldtrain8849]

@@fnaguitarplayer9 You're very welcome. Just wondering.

[@bobpits3364]

"Spray holes but wear safety glasses cause you don't know where it's going to come out from" Well.. I've learned that the hard way. Many times. Carb cleaner and brake cleaner doesn't feel too good if even a drop gets in your eye... What a screaming sensation

[@johnstrange6799]

Nice!

[@fnaguitarplayer9]

Thanks for Watching!!!

[@chrishotrod6603]

I enjoy your videos always learn something new. I have a 19.5hp opposing twin n when mower sits for a week n i go to start it it takes lil while n when it starts it back fires. Any ideas would help

[@fnaguitarplayer9]

Thanks! Mine does that sometimes too, then other times it starts right up. I did have to rebuild the carb and fuel pump last summer and after that it seemed to help, and i noticed the old diaphragm in the fuel pump was worn and in crooked, so i'm guessing it allowed fuel to back flow out of the carb somehow and make it hard to start. But now it will crank for like 4 seconds or so then fire up. Thanks for Watching!!!

[@chrishotrod6603]

@@fnaguitarplayer9 thanks for help im gonna try it

[@fnaguitarplayer9]

@@chrishotrod6603 your welcome