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/p...|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.

[@jasonwisser3253]

My exact problem as well. Probably watched 30 videos before finding this one 👍👍👍

[@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.

[@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.

[@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.

[@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!

[@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.

[@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.

[@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.

[@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!

[@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.

[@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.

[@angelofraietta3156]

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

[@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

[@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.

[@NewShockerGuy]

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

[@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.

[@chriscargill8140]

Good video, now I can rebuild this carburetor with confidence 🥰🥰🥰🥰

[@terrymastalski3625]

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

[@ArsonCampos]

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

[@davidlundy2805]

Excellent video. Clear and thorough

[@TheManCaveVideo]

Thanks for the feedback!

[@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.

[@detailedinfinity]

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

[@cherokeefiddler]

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

[@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.

[@TAndrew368]

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

[@gageberube4553]

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

[@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.

[@lwoodt1]

Very well explained and simple to follow. Thank you.

[@beegee22]

Thanks! Nicely filmed and well explained.

[@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.

[@juanf1709]

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

[@heliosalimdeamorim708]

Thank you so much (from Brazil)

[@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.

[@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.

[@gopimalur3518]

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

[@TheManCaveVideo]

Awesome. Glad to hear that.

[@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!

[@jamiethomas9405]

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

[@98Blackbess]

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

[@TheManCaveVideo]

You're welcome!

[@JasonSmith-qx3zh]

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

[@JS-gt2qf]

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

[@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.

[@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

[@texasranger1212]

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

[@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.

[@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.

[@lindaclayton8701]

Just the video I needed. Tthanks😃👍

[@TheManCaveVideo]

You're welcome.

[@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.

[@smarterink1]

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

[@docwilson3164]

Thank you very much extremely helpful!!

[@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.

[@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.

[@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.

[@wahpykamel1468]

Very good video. Thanks

[@Beneduzisantacruz]

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

[@elmakednos]

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

[@realestateinfonet9041]

Great video! Thanks for sharing!

[@erdoganessat2505]

great video thank you so much.

[@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.

[@jacksparrow5408]

Hello, these are immortal engines that are going to repair for a little money, thanks.

[@tomschisler1545]

thank U very much. the video was great

[@mcconn746]

Great video...thanks.

[@gleni8651]

Great video. Unfortunately my jet will not come out it will break if I try to force it so I'm just gonna spray the best I can

[@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.

[@MGB-learning]

Great Job! Thanks

[@TheManCaveVideo]

Thank you. I appreciate the comment.

[@patmontecino8009]

THANK YOU SO MUCH FOR THAT VIDEO BRO

[@TheManCaveVideo]

You are welcome.

[@gradyhernandez4699]

11:03 ​@@TheManCaveVideo

[@gradyhernandez4699]

​@@TheManCaveVideowhat is the part numbers for carb kit?

[@gradyhernandez4699]

3/8 and 1/2 bolts

[@yukonjacque1656]

Thx man very clear to see and do.

[@rupertconnelly8778]

Very easy to follow. Thanks.

[@TheManCaveVideo]

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

[@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???

[@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!

[@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.

[@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!

[@johnnyrouse2713]

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

[@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?

[@tranquillitylandscaping3001]

The only other thing I would like to add when I copied this procedure is when pulling the carburettor from the machine the o ring & plastic sleeve from the carb came out from the carb so a upon starting after the service the machine still hunted up & down on revs due to the fact the vacuum in the carb was not correct as the carb & manifold were not sealed due to o ring sitting loosely on manifold in front of carburettor Video was a great help thank 👍

[@jimmysmith4552]

Good time to change the primer bulb

[@martystevens3969]

Get 2 air cleaner studs and cut off the tops. Screw them into the tank holes of the carb. to use as a line-up tool. Put the diaphragm down on the tank and then the carb. If the engine still don't run right, replace the carb. Check the spark plug. Tighten the head bolts. They loosen up. Use a 3/8 Dr. inch lb. torque wrench. Use a Stens oil change tool- #752-828. Amazon has it. The top piston ring is thin. Remove the ring ridge before removing the piston. Check the compression. It should be about 90 lbs.

[@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.

[@richh1576]

These push button/bulb 'choked' B&S engines are a PITA. My go to 'cure' if the bulb is inoperative is to simply fill the tank to near full, rotate the entire mower by 90° using the front wheels as the pivot point .... this will allow the push bulb to fill/operate - give it a few squeezes in the 90° rotated position, rotate the mower back to the ground, then start the engine. Use stabilizer and a bacterio-stat in your fuel. When putting the engine up of the season, fill the tank with 'canned' ECCO, etc. stabilized, hi-octane, blended fuel (About $15.00/gallon from Home Depot, etc.), run the engine for about 15 minute, shut down and refill the tank to the top, then seal the VENT on the tank cap. I do this on all my small engines: outboards, weed-whackers, chainsaws, small mowers .... and RARELY have a starting problem the following season. Most of the old style 'fuel stabilizers' are not effective for ethanol *contaminated* gasoline, use the 'canned' fuel for when long term storing your engines. If you have access to general aviation (small airport) supply - use high octane, alcohol free, AV-gas and then add standard gasoline stabilizer. Hope this helps.

[@luigitorchia8866]

Thank You. Your video was a great help.

[@TheManCaveVideo]

Glad to hear it. Thanks for watching!

[@yaheng]

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

[@jreeder6168]

Didn't go into the bulb and cleat it. Mine has a tiny steel ball in it. Would like to see the function of it. Mine just rolls around in there.

[@bali2880]

Thanks for your video it was very helpful 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍 👍

[@TheManCaveVideo]

+Bali Bali you're welcome. Thanks for the comment.

[@johnabalos1455]

My mower started doing this exactly like this one , a friend at work asked if it was blowing black smoke, I said yes!! ,an he told me it was a worn diaphragm gasket between carburetor an fuel tank , spent $5.00 at Ace Hardware,runs like new again.

[@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)

[@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

[@awjfagan]

Thanks a lot, weekend job for me. Hopefully as successful as you.

[@TheManCaveVideo]

+Andrew Fagan good luck.

[@kevinboland9627]

What about the primer button if it's not working

[@xpymando]

Thanks mate really helpful.

[@GabrielKozsar]

Do you know the torque spec on the cylinder head bolt by any chance ? Thank you

[@alsdjfknbo]

thanks for the vid

[@theresahoffman8408]

What rebuild kit am i asking for for this 'built on tank' Carburetor?

[@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.

[@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

[@meritatanielu9346]

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

[@TheManCaveVideo]

+Merita Tanielu you are very welcome.

[@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.

[@randallstewart8772]

What do you call the red bowl your rebuilding carb in ?

[@onsuchenh6101]

You do good work thanks