Briggs and Stratton Plastic Pulsa Prime Carburetor (Carb) Rebuild

This is showing how to remove and rebuild a carburetor on a Briggs and Stratton engine on a lawn mower. This can be applied to any outdoor power equipment powered by a similar engine. This type of carb is found on many different B&S engines from 3 to 5 hp.
The kit is a B&S part # 495770 and comes with the diaphragm, the gasket, filter screen and spring. I bought mine from Lowe's for $4.98 + tax. This is an easy and cheap fix for a engine that is surging.
www.lowes.com/pd_219691-85794-...|0&pl=1&currentURL=%3FNs%3Dp_product_price%7C0%26Ntt%3Dbriggs%26page%3D1&facetInfo=

[@baddad5781]

Been studying and messing with small engine repair and watching many many youtube videos for over 2 and a half years and this is one of the best carb videos for this type carb I've ever seen BRAVO.

[@TheManCaveVideo]

Thank you.

[@marshallmakes4928]

Nobody else bothered to take the main jet out but that was my problem. Thank you for showing that step, I appreciate your knowledge!

[@TheManCaveVideo]

So glad the video helped you out!

[@Tommy43132]

​@@TheManCaveVideo July 2024. Main jet was plugged up bad. Running great now. Thanks.

[@jimrose2461]

This one of the best carburetor videos for Briggs and Stratton online. Extremely videoed and great explanation as he disassembled and reassembled. Great job.

[@Harleybobtailminnow]

Watched three videos on this and yours is the best; you were the only one who bothered to take out and clean the jet. Thanks to you my mower now runs sweetly, with its cleaned out carb and an airtight new gasket and diaphragm in situ.

[@jedediahbc]

You fixed that thing perfectly, I try to work on a lot of small egines I get mine from the county dump or yard sales people tell me they are broken and beyond repair and give them to me just to get rid of. Most of the time I just take the carb of and clean and adjust it and it runs like a top, people just don't understand how simple the 4 stroke engine is.

[@jondunkle4806]

I spent two days trying to find a video showing how to rebuild or replace the Carb on a 550 series engine. You nailed it, Thanks

[@TheManCaveVideo]

You're welcome and thanks for the nice comment.

[@danieltaylor4819]

Great video, simple and easy to understand. My 20 year old mower was running badly, so I replaced the diaphragm and gasket, thinking that would solve the problem. It still ran badly. I determined that the bottom of the carburetor, being plastic was warped and not sealing properly, creating an air leak. I added another gasket and solved the problem, ran fine then. I believe you could take a fine-tooth file and place it flat on the bottom of the carb and carefully dress it, to create a flat surface, or possibly use some gasket sealer. I may give that a try next time.

[@marshallalbright3488]

Just wanted to say thank you! Followed this to a T and fixed my mower! Can't say I'm mechanically inclined in anyway so this helped a lot!

[@TheManCaveVideo]

I appreciate that very much. This is exactly why I like making this type of video. I know that it won't fix them all but it is fantastic to hear that it has helped so many.

[@angelofraietta3156]

Thanks - very helpful. I was able to get my mower going for $3.20 thanks to your video.

[@johnblackburn7673]

Watched several of these carb repair videos your is by far the best. Great video thankyou Jack

[@TheManCaveVideo]

Thanks for the nice comments. I really appreciate it.

[@bradpool127]

Watched this video a few times now and finally I'm doing just this on my mower now. Can't wait to hear it running. Edit: Performed carby clean as per video and mower is running sweet. There was a bit of gunk embedded in the filter screen of the fuel pick up, couldn't see any other blockages anywhere but could have been and the plastic jet you lever out with small screwdriver seemed clean. The local briggs dealer told me you could pull out the fuel pick up to clean but I should have asked him to show me how as I was afraid of breaking it. Seemed very stuck in there although it would turn. Instead I squirted starter fluid in there and blew it out with air gun both from the pick up filter mesh side and also from the hole in the carby it's connected to. You see which hole is connected when you blow out the started fluid from the pick up side. I alternatively sprayed the starter fluid in and blew out one side and then from the other until the debris were no longer visible inside the filter screen. Somehow debris got in there and weren't just on the outside. Got a new set of diaphragm & gasket for $12 ($AUS). After 10 years the diaphragm was a bit stretched and worn. Oil long overdue for change and was evident by the sludge that started accumulating. Checked valve clearances - Intake was right within spec but exhaust was bit over spec. May lap valves and make adjustments at a later date. Thanks for giving me the confidence to attack this carby with a bit of knowledge of what to expect. Cheers! Brad.

[@detailedinfinity]

Thanks for your time. My B&S engine surges and I followed you instructions. Love the toilet brush!!!

[@mrceej]

Just wanted to say thank you for posting this video, I have the exact same type of mower that's showing signs of age now. The breakdown of the carb was exactly what I needed.

[@TheManCaveVideo]

mrceej glad to hear that this video is helpful. Good luck with the repair!

[@julianlangdon3456]

Thanks for my now running Lawnmower. In my case the Carb jets were clogged up and the bowl in the top of the tank was full of crud.

[@Allan-]

Thanks for a great VIDEO, I had troubles with my mower and after replacing the Gasket and Diaphragm it would still only start and then stop, looking at your video showed me that the fuel jet was and how to clean it, doing that fixed it . Thanks heaps

[@NewShockerGuy]

Great video! Used this to fix my lawn mower. Now it no longer sounds like ass and actually does what it should..lol

[@shannonbrooks8834]

I had a Briggs that was surging. I screwed the breather tube up and it stopped surging. It was a little loose, so in all the way and back out just enough too get the rubber tube back on carb.

[@ArsonCampos]

thanks for actually explaining something. it helps to know more than Step 1, step 2 step 3. ect..

[@WoolyBuggerPicker]

Great helpful vid! and thanks for the soothing narration without muzak :-)

[@TheManCaveVideo]

+Sherwood Nash thanks for the nice comments. Glad you found it helpful.

[@cherokeefiddler]

Nice thorough video on cleaning the B&S Pulsa carb.

[@dougselsam5393]

Watched a few of these videos, bought a B&S diaphragm "carb rebuild kit" from Lowes, installed the new diaphragm and gasket, and it runs like new. Before, it would only run for like 3 or 4 seconds then quit. Yup wouldda been pretty dumb to throw it away. Imagine how much profit there is in leaving a single weak point guaranteed to fail in 5 years or so - most people will just buy a whole new lawnmower. Not me. I didn't want to be one of those dummies,, so I spent a week working on it and watching videos, and saved a hundred and fifty bucks plus tax! :)))

[@TheManCaveVideo]

Well done!

[@JamesBrown-bv2nh]

I noticed the lose wheel bolt on the front right side by the discharge chute right away at 0:15. The mower sounds great after you where done.

[@ancientastronut9915]

Great video. Unfortunately for me, I found this after I'd already chased problems around and ended up spending that $30 you mentioned before it was fixed. My mower is just in its 4th season and I've had problems since season 2. My warranty had me taking it 80 miles round trip for service so I struggled. Just replaced the whole carb to find that the bulb was leaking air, the tank had trash, the alum. breather bolt stripped out, and that rubber elbow had cracks in it. After replacing the carb I made a 4 1/4" threaded steel rod for the breather and now use a wing nut to remove the breather for cleaning. Runs better than new now! Thanks

[@TheManCaveVideo]

What an adventure! Glad you got it fixed. Good to hear that it runs better than new. I had that happen with a weedeater once. When I was done with it, it had way more power and was more responsive than the first time I used it.

[@lwoodt1]

Very well explained and simple to follow. Thank you.

[@terrymastalski3625]

Very well done video, and an extra thanks for the part # for the rebuild kit

[@gageberube4553]

Thank you, a very nice step by step guide. helped me fix my old push mower.

[@lindsayfontaine9679]

Great video! I have basically the same mower thats been taken out of storage and now it wont rev up and pops from the exhaust- any ideas? (new air cleaner, new spark)

[@robertburket5317]

Excellent video. You made everything very easy to understand. I have it saved to my favorites.

[@TheManCaveVideo]

+robert burket thanks for the kind words. I appreciate the input.

[@davidlundy2805]

Excellent video. Clear and thorough

[@TheManCaveVideo]

Thanks for the feedback!

[@juanf1709]

Excellent video. Watching this explanation I could repair my carburetor. Thanks from Argentina

[@biggs.8368]

Great video: It only took me about a half hour to finish this project of course I did a little more cleanup on my mower. Worked out great! I have to confess I also forgot to put that little gasket back on the top of the carburetor. One more question where did you purchase that nice pan? Tony Wiesel had a great???

[@carlbrinton4639]

Great film, I cleaned the carb a few weeks ago after it ran for a few moments before cutting out. It ran smooth for a couple of times, now it seems to be running very slowly, if it’s not the carb you said it could be the Linkage at the front. How do you fix that ? I have a big bush I mow under and I’m concerned I’ve damaged that part. Hopefully it’s the carb, so I will give it a try at the weekend. Got my carb cleaner and a new gasket and diaphragm and I’m ready to go . Any advice is greatly appreciated . I work in an office all day so I’m not a practical chap, but I’m determined to fix his dam machine !!! Thanks.

[@beegee22]

Thanks! Nicely filmed and well explained.

[@jamiethomas9405]

great video. followed step by step to fix my surging mower. Thank you

[@hicoteo]

Very helpful, thanks. What does the diaphragm spring do? I just took my carburetor apart and it's missing. It's been running OK, though.

[@kmart2834]

Thanks for the great information, your detailed explanation and the way you shot the video. With your help, I was able to fix my engine with confidence and on the cheap!

[@TheManCaveVideo]

+Keith Martin You're welcome! It's great to hear about others getting their stuff up and running....especially "on the cheap". :)

[@garyharris1932]

Keith Martin the best.

[@ChunkyMonkaayyy]

Do you know if you can buy a replacement carb for B&S where the carb is attached to the tank. I did a carb replacement on my edger for $30 shipped and I liked how fast and easy it was replacing the whole thing.

[@angelisone]

Kit doesn't come with the O-Ring (4:13)? One of the best video without much editing. Got one on how to on ATG Husqvarna MZ61 61 inch 24 HP?

[@mitopy]

Excellent video and perfect explanation - good and slow English so that even foreigner can understand ! Great thanks for the advice that helped me to get rid of annoying thing with my machine :). The author deserves a couple of good beers :)

[@TheManCaveVideo]

+mitopy Thank you for your kind comments and I'm glad that this video was helpful to you.

[@666Eddie123321]

my mower sounds exactly like this. well, at least it sounded like this last week. because now it isnt starting at all. so chances are high that it has something to with the Carb?

[@jlai3861]

My lawn mower is running weak and rough for a bout a year and finally it stopped working, the thing is if I prime it, it can run about 30 seconds and stopped, I figure it's time to rebuild carb, bought the same part as in your video and throughly cleaned every thing, prime it and it start easy and I immediately noticed it sounds much smoother just like new, but unfortunately it stopped again after 30 seconds, I ran out of idea what else can be done to bring it back to work.

[@louismartinez7772]

Great video, I followed your steps but it still didn't start. Any other suggestions?

[@juanf1709]

Hello. Thanks for the video. I have the same engine but : when I start the engine it begans to lose gasoline between the tank and the carburetor, where the diaphragm is. Could you tell me what could be the problem?? THANKS VERY MUCH, and hugs from Argentina-

[@vanhouten64]

Is that jet always removable? My carburetor looks exactly the same but I can't get that component out of the tube it's set within.

[@texasranger1212]

Very good video! Thanks for your useful explanations. Best wishes, man!

[@dadrules714]

EXCELLENT ! I have a yard machine tiller same carb doing same thing. . I put a tester on the plug/wire getting sputtering spark(makes sense with stahling carb) was about to buy a $25 coil pack. instead it's a $5 fix. Thanks for the 411 & great Vid. off to grind up some weeds in garden !

[@TheManCaveVideo]

I'm glad the video helped out. It's always a good feeling when it turns out to be something less expensive than expected.

[@JS-gt2qf]

Clear and concise directions. Thank you for reassembling on video as well, it really helped me out.

[@docwilson3164]

Thank you very much extremely helpful!!

[@Beneduzisantacruz]

Pretty nice job,very good and clear information,thanks from Brasil!.

[@miguelabrego8192]

excellent video but I think I did something wrong my yet has a flat side and I don't which side goes towards the engine or does not matter, can you help me out?

[@keithgolden438]

Well done. Thanks. I bought a kit on amazon and for some reason the primer bulb has a small molded hole in the centre of the bulb. Is this something new or something wrong.

[@TAndrew368]

Great Video, will try cleanning that jet tube. Thanks for the tip.

[@larcat3148]

*Well done* !, very well presented. As an aside comment : The order of nipping in / snug fit of the carb screws. You went in a concentric fashion.The *Haynes Small Engine Repair Manual* recommends "Tighten the pump cover screws in small increments, following a cross-pattern, to avoid distortion of the cover." *The Briggs and Stratton Repair Manual* for Single Cylinder 4 Cycle engines mentions how to "Pre-Load Diaphragm" for a Vacu-Jet carb, saying to "Hold choke while tightening carburetor mounting screws in a staggered sequence". Some people suggest the same method as doing a cylinder head but really, this is plastic, surely the torque is not that great. Mmmmh the jury is still out on this one !

[@michaelkisil4052]

there is no choke on this carb.

[@prawnjohn]

you are the first person i have seen take out the wire mesh filter to clean the jet well done! does the mesh pull out or did you have to ease it out with a screwdriver?

[@jtknight4061]

You can twist the mesh, to loosen it and then pull it. It should come right off.

[@ekimosurac1]

When reattaching the gas tank, i over tightened the bigger screw, 3/8 or 9mm, and busted out the cast housing that receives it. Engine still runs without that screw but the tank rattles and that friction can't be good for it over time. Any suggestions? Thanks.

[@ElliotFlowers]

You should have an index with times, at key points. I came back to this the next day after watching it. Carb removal at....jet cleaing at...etc...good video, and you only say what needs to be said.

[@TheManCaveVideo]

Thanks for that idea.

[@ElliotFlowers]

And to conclude - with this video - I fixed my lawnmower and mowed my lawns!!!! Cheers!

[@heliosalimdeamorim708]

Thank you so much (from Brazil)

[@98Blackbess]

Excellent. I have just ordered the gaskets. Thank you. :-) :-) :-)

[@TheManCaveVideo]

You're welcome!

[@Ratchet-strap-Garage]

Do you have any idea what the part number is for the bail cable on that mower ? I have the same exact mower with a Tecumseh engine , I'd like to swap it out with a good Briggs I have on hand

[@JasonSmith-qx3zh]

Thanks for this yur good efforts on this is very much appreciated great video!

[@elmakednos]

Had a sprint 40 old engine in bad contition.Finally after rebuild it itgot started and working.

[@copedennis1]

If you have to pump it a lot to get it started the first time but after it is hot it starts easy I would make sure the bubble does not have a leak. The fact that it runs good when it finally starts would eliminate ign.

[@fredericschabel4614]

Great video Sir. About to go to Lowes and buy the kit. Everything is cleaned up. Will let you know how it goes. Worked like a charm, one hour worth of labor, $4.29 for the Gumout, $4.98 for the kit and $2.97 for a spark plug that will keep as spare. Thanks again.

[@TTTT-rc4fv]

Hi, I have the same carb in my troy built washer but my issue is that it surges. I took apart the carb and everything looked great and clean what do you think the issue could be? It smokes lightly and burns gas too fast. I took off the air filter to see if that was the issue but it keeps surging.

[@yukonjacque1656]

Thx man very clear to see and do.

[@mdkarnish]

Thanks for the very thorough video! Great result after the carb cleanup and rebuild. The engine sounds smooth. Do you have the part# for this B & S carb rebuild kit? In the mean time I'll google for the part number, as I do have the carb part# that should lead me to the kit. Brief story - a friend of mine purchased a Craftsman mower with the very same engine and pulsa jet carburetor. The dishonest man that sold it to her claimed he rebuilt the carb. She eventually gave the mower to me because it stopped running. When I removed the carb, I discovered that the screen filter that slips over the jet was missing, hence the reason the mower stopped operating.

[@TheManCaveVideo]

The kit is a B&S part # 495770 and comes with the diaphragm, the gasket, filter screen and spring. I bought mine from Lowe's for $4.98 + tax. Thanks for watching and good luck to you on your mower.

[@ronbovee3787]

4 days I been trying to figure out my push mower problem. Dozens of videos and I have done have as many repairs! Then look and behold you present "MY" mower with exact same issue! It even sounds the same before repairs! I am of to Ace (because it's a mile away : ) as soon as I finish this vid! I hope this works my grass is almost knee high!! Lol Thank you sir for this video!! Thank you!

[@stephenfysh5265]

hi great video it will help me with my mowers problems one has this problem the other will be a total rebiuld, just one comment about your video is that you clean the carb and tank but not the area of the engine where you are fitting this nice clean carb and tank back too, why not clean everything

[@TheManCaveVideo]

+Stephen fysh I had blown everything loose off with the air hose. Most of what looked dirty on the cover of the motor around where the tank and carb mount was missing paint and rust. However, you're right, I could have taken a little more time cleaning. I hope your repairs go well for you. Thanks for watching!

[@smithjimmy8605]

sometimes the 2 rings on the carb come off on the intake tube. The rubber o rings go in side the tube on the carb the white rings snap inside the carb to hold the black one on place

[@robbyjones7631]

Get 2 air cleaner screws for that carburetor and cut the tops off. Use them as lineup tools to replace the diaphragm. Brigg has a tool to replace the primer bulb. Amazon has it. The tang bracket is to adjust govonor speed. If the carburetor still acts up, replace the carburetor. The soft gasket goes on the bottom on the tank. The top goes on the carburetor bottom. The pickup tube pulls off and installs by twisting and pulling. Make sure you have the right govonor springs. Remove the flywheel and replace the top seal and also replace the lower seal. Their is a special oil drain tool from Amazon for 4 h.p. There are valve guide tools from Amazon. Replace the valve seal from the valve.

[@anghelteodorclaudiu508]

can you please tell me why the engine stops, and sucks in the red pumped red rubber, could be the bump diaphragm, or one of the filter webs

[@dondesnoo1771]

So I ordered the kit. ran but hard starting originally with the kit wouldn't run at all with new carb found a mower w a wheel missing on cleanup took my wheel put on mower good to go that was how I done it 😅

[@TheManCaveVideo]

Sometimes you just got to do what works.

[@derekkeane1008]

You can also pull some wire from your brush and put one end of you wire and push it into the end of a Mach stick so if you loose you wire brush.

[@lindaclayton8701]

Just the video I needed. Tthanks😃👍

[@TheManCaveVideo]

You're welcome.

[@smarterink1]

Thanks for the video. I lost both bolts. Where i can buy those bolts. Thanks.

[@docwilson3164]

what are the symptoms of a bad diaphragm & gasket?

[@realestateinfonet9041]

Great video! Thanks for sharing!

[@1232bluejays]

Mine still doesn't run right . I used mass air flow cleaner instead of carb cleaner. My pick up tube screen looks like it has stuff trapped behind it

[@ppplll000999]

My Briggs with Pulsa, needs to pump more than 6 times & still hard to start. But once started, runs smooth. Re-start easy when it is still hot after running. If once started, it runs good, then could it be likely the diaphragm ? I cleaned the carburetor but did not replace it because I did not SEE any rip on it. What is your opinion from experience ?

[@Simplexaero]

Replacing the diaphragm as shown in this video may solve it. However, another option which is equally as easy is to look at your ignition system. It's even simpler. These types of engines have a simple magnetron ignition system. Just do a youtube search for videos of removing the ignition module, sanding/cleaning the face of it, sanding and removing rust from the magnets on the flywheel and reinstalling with the proper gap (using a business card). This will strengthen and potentially give a hotter and stronger spark to aid in hard starting and potential misfiring. You should also replace the spark plug in this process just to rule it out.

[@johnnyrouse2713]

How important are the springs where do they go when I'm come off and it's broke any help would be greatly

[@wahpykamel1468]

Very good video. Thanks

[@erdoganessat2505]

great video thank you so much.

[@mcconn746]

Great video...thanks.

[@xpymando]

Thanks mate really helpful.

[@johnmac3931]

I know this post is over 7 years ago, but does anyone know the name/number etc of the black o ring and the white retainer that goes into the carbi outlet that goes onto the tank? I cant bloody find one any where even buying a whole new tank and carbi nobody supplies the black o ring with white retainer

[@patmontecino8009]

THANK YOU SO MUCH FOR THAT VIDEO BRO

[@TheManCaveVideo]

You are welcome.

[@gopimalur3518]

Grate vedio as per your instructions I fix my lawnmower. Thank you very much. I'm happy..

[@TheManCaveVideo]

Awesome. Glad to hear that.

[@chefkdowg]

I've never in my 21 years of mower repair, have removed the center jet. And no one I know uses that damn screen. I've had a couple of carbs, where the screen was the biggest problem. Make sure you do have that spring in there! It will cause headache. The bolts are standard. It's 1/2" and 3/8". There was a couple of years 93-96 that they used 3/8" all around except the oil tube that was 1/4"

[@BIG_DRU]

chef souffle So you’re saying the carb is better of without the screen?

[@chefkdowg]

@@BIG_DRU in the center over the jet, yes. The long tube, keep that screen.

[@MGB-learning]

Great Job! Thanks

[@TheManCaveVideo]

Thank you. I appreciate the comment.

[@robreeves4562]

Thanks for the video as it was very comprehensive? Job done and my mower is going much better Cheers :)

[@TheManCaveVideo]

+Rob Reeves You're welcome Rob. Glad it helped you out.

[@ryshaystudio77]

You never mentioned the o-ring and washer that goes on the end of carb tube before you slip it on to the intake tube. Also you never hooked up the govenor linkage. How did it start??

[@TheManCaveVideo]

I never took the O-ring out of the carburetor. You can see it in the carburetor at the 3:10 mark and again at 12:08 just before I slide the carburetor onto the intake tube. I hook up the linkage at 12:25 as i am sliding the tank and carburetor into position and I mentioned how easy it is to do when the tank is loose.

[@ferro1998]

franz ferro Very helpful video. Thanks!

[@luigitorchia8866]

Thank You. Your video was a great help.

[@TheManCaveVideo]

Glad to hear it. Thanks for watching!

[@wahpykamel1468]

Dear Sir I clean the carborator but m/c did not work Thanks

[@yaheng]

Is that a chance, I don’t need to change the gasket and diaphragm?

[@OnePunjab]

Hi, I have same lawnmower engine, but problem am facing is engine starts and then stops after around 30-40 secs, i have already changed spark plug, cleaned the carb, but this problem is still there, not sure whats wrong, can you suggest or help , any idea ?

[@TheManCaveVideo]

+One Channel it still sounds like a fuel delivery problem to me. If you didn't replace the diaphragm, I would try that. It sounds like it might be choking enough fuel into the carburetor to run for a short time and then starves itself out. Good luck!

[@alsdjfknbo]

thanks for the vid

[@rupertconnelly8778]

Very easy to follow. Thanks.

[@TheManCaveVideo]

+Rupert Connelly you're welcome. Thanks for the feedback.

[@meritatanielu9346]

Thank you very much, I know that will be a lot of help for me.

[@TheManCaveVideo]

+Merita Tanielu you are very welcome.

[@inscoredbz]

Do you know what the part number is for the kit? I've got one doing the same thing, well it was. This year it won't even start unless I pore gas down in the carb. The primer bulb still works, so I figure the pump diaphragm is bad or the jet is plugged.

[@bunnyheywood]

Stens 520-175 replaces 495770 B & Stratton

[@astapelkuparter4653]

Amazing!