CARBURETOR Repair on Older BRIGGS & STRATTON 3.5HP Engine Part 1 of 2

[@iwts145]

This is the second time one of your videos saved my lawnmower. In the beginning of the summer i resurrected an old one by following your video, but then it got stolen. We had a very old lawn mower sitting around that hadn't been used in at least 10 years. This morning I cleaned the carb, replaced the air filter and she fired right up. Thank you for all your help. You've saved me a ton of money.

[@nowthatsfunny1]

Wow you should start a old lawn mower museum! I've never seen such old lawn mowers in my life and I'm 50 years old! lol Good job.

[@spiavsspia]

Don this is what I needed to see of all the inherited motors, lawn mowers, and Rotax and Cuyna motors that my Father gave me after he passed away ..to tell you the truth I am a little scared of the Cuyuna and Rotax (bombardier) motors, but this will get me started on the single lung motors thanks John, Oregon

[@gerrymcgovern1234]

Thanks a million for this. I still have my 1983 Montfield mower with this engine. It had stopped and wouldn’t start and with your excellent video it’s now running better than ever 👍👍

[@johnpearson2229]

Thank you for posting this video and part two. It helped me bring an old dead lawnmower back to life.

[@victorhuynh3418]

After your watch video, my lawnmower is back to running condition again, you are awesome, thanks a lot

[@YamahaT2man]

Many many thanks for posting this video. I have a 1974 Mountfield M3 mower (with a Briggs & Stratton engine) which had lain unused for the last 7 years, because it was impossible to start. Courtesy of your tuition, I had the courage to remove and clean out the fuel tank and carburettor. My M3 now runs almost like new. (Only "almost" probably because it is now impossible to obtain the correct fuel for this engine ---- i.e. 4-star leaded. But at least it DOES run on 2-star unleaded, with a little squirt of Redex !!). Thanks once again ..............

[@vakaruvejas]

I have an old dead lawn mover with exactly the same engine, and the problem was in the points, I discovered that with multimeter, but this video helped me with taking out the flywheel from the axis. So thank you very much, today I managed to start my B&S!

[@JeffSturley]

Thank you so much, first video I’ve seen with vacuum diaphragm. My masport is having issues.

[@donyboy73]

@kvb1085 usually it is on the side of the engine at the bottom. just a scew cap and no dipstick. u can use sae 30, 5w30 or 10w30

[@donyboy73]

@gavinabcdefghi i used carburetor cleaner, you can get the diaphragm at a small engine shop and sometimes on Ebay

[@royramsey6483]

Anybody know the part number for the diaphragm? Thanks

[@donyboy73]

@mrbluenun thanks, all videos are made and edited by myself, over 500 of them

[@k.m.parekh4697]

I did not realize you had posted this...I love your videos.

[@adriantomlin2902]

Very nice job depicting and explaining in layman's terms! Thanks

[@AlexandrShafer]

Thank you for putting this video up, it gave me the confidence to do a successful tune-up of my mower! Much appreciated!

[@donyboy73]

@rosolion i think the diaphragm is 391681 from briggs

[@donyboy73]

@NewHollandTom it's put away but those are automatic choke, if it doesn't work well u might want to replace the diaphragm

[@kylepellegrino7840]

I have what is essentially the same tiller and it needs this done.....Great video.....THANKS!!!

[@donyboy73]

i think what you talking about is a crankcase breather pipe, you can buy the rubber elbow pipe at any small engine shop

[@soundadvise8677]

If you want to save yourself time, and not do things twice, ALWAYS clean the outside of the parts first, BEFORE disassembling anything. It's just good practice.

[@donyboy73]

@1972porkchop does it even have an adj. screw? some don't

[@donyboy73]

@1972porkchop how's the diaphragm?

[@donyboy73]

@acscolo sure i'll show that in some future video

[@donyboy73]

@ibbiggs sometimes you can if they are still good and just add a bit of rtv silicone

[@donyboy73]

@skidmore75 thanks, I use nitrile or vinyl gloves

[@booterbuilder]

Thanks for the info! Now I just need to figure out the fine tuning. My mower didnt have the 1/2 inch bolt to take out the jet. I wasnt sure how to find it/get it out, so I just put the thing back together. Mower worked, but was burning a bit blue, and stalled fairly often. Thanks again!

[@ackdaw]

brilliant , clear and concise , makes a job that was going to be difficult a enjoyable exercise even though the outcome has been down to you and your clear video and iv,e given myself a pat on the back but the credit for it goes to you , many thanks

[@u-soundagoraphobik1521]

Thanks mate ! Just followed your vid and my engine started right afrer mounting it back. No works like a charm !!

[@dhruvshah7545]

Good video. Where can I get the diaphragm from?

[@haditwithwork]

For my 1982 B&S 187cc 4hp engine, Model 114902 Type 3137-01 Code 84021004, I got my replacement diaphragm on eBay, Part Number 391681.

[@donyboy73]

@ackdaw thanks for watching

[@pyromaniaAlways]

Hey man I have a question...I have a briggs and stratton 3.5 but its not the same model as yours and I'm not really sure what model it is but there is a little metal pipe that seems to run from the engine to the carb, I can not figure out what it is and I need another piece of rubber to secure it to the carb. If you could explain what this is and how much it would cost to get the little rubber fixture and where at to get it that would be great...BTW nice vid

[@acscolo]

I really like your videos, Keep 'em coming. Would it be possible to show your shop's work bench and the way you have your sockets and screw drivers on the wall. I've seem them just a little in the background. They look very well organized.

[@donyboy73]

@superbillc spray a bit of gas in the carb to start off, maybe adjust the screw. or you can spray a bit of gas through the spark plug hole. if it doesn't start it could be deeper issues. it is hard for me to diagnose without seeing it

[@robviolin1]

I have a briggs & stratton 12hp with vertical shaft. I was taking off the crankcase plate to change the oil seal and the slinger-oil fell out and I am not sure how it fits back on. Is there any way you could help me put the slinger-oil back in it's position. thanks

[@donyboy73]

@iwts145 glad to hear that!

[@donyboy73]

@camry01 i think the part# is in the second vid

[@terassimus_playa2501]

I saw another video in which the low spring was on opposite side of the diaphragm, i.e., on the carburetor side. In this video it is on the tank side. Is there some rule relating to this?

[@terassimus_playa2501]

Problem solved. 😊

[@tomlewitt]

@@terassimus_playa2501 So which side does the short spring and its seat go on?

[@terassimus_playa2501]

@@tomlewitt Donyboy manages these. So follow him. 😊

[@ryry7886]

So i cleaned the carb and gas tank as they were filthy. I put it back on and i still got nothing. Everything seems to kick back like it supposed to. I checked compression and got a little over 60. When i check for spark i cant see any but if i hold it the wrong way i sure can feel it. Do you have to be able to see it? Even in day light?

[@donyboy73]

@pdspublishing maybe the adjusting screw is too far out. also make sure the gas cap is venting, i would have to physically see it to help u more

[@JoshBowles-l9f]

I just pulled one of these tillers out of the trash. Would you be able to provide the Make and model of yours so I have something to reference please? I know it is a 3.5 horse briggs and that is it. Thanks

[@gregorymalchuk272]

The engine related stuff can be found from the Briggs and Stratton engine code on the cowling just above the spark plug. If you want stuff for the tiller like belts or gearbox components, you need the tiller model and serial plate. It's probably stamped aluminum mounted somewhere on the tiller.

[@TheDevo76]

Very good video , thanks so much for posting, i have one question , when taking the diaphram off i ran into a spring the size of a dime, does that fit under the diaphram or on top?

[@donyboy73]

@QUALITY1412 no shut off valve

[@KevinH673]

This was huuuuuge in helping me. Followed along with the video, thanks so much.

[@KevinH673]

This was huuuuuge in helping me. Followed step by step, thanks alot!

[@patchp22]

ok i have a 5 horse motor and it's pretty old and i took the carb out and i am missing a air filter the whole thing and that spring on the diaphram and is there any spacific place i should get that stuff or what?

[@zyplex1]

Dony, on these older carbs, do they all have the wider spring under neath the diaphragm or depending on the carb is it just the smaller spring attached to the diaphragm ? Thx

[@patchp22]

ok i have a 5 horse motor and it's pretty old and i took the carb out and i am missing a air filter the whole thing and that spring on the diaphram and is there any spacific place i should get that stuff or what? and the screens on te diaphram

[@donyboy73]

@visuallogic thanks dude!

[@FirebirdRestores]

How do you get the spring out the diaphragm since I have to replace the diaphragm

[@chaddon5]

Nice clear video. I suggest cleaning the outside of the carb and petrol tank before you open it up. Less chance of getting dirt and grass inside the carb. Always put a new diaphragm in the carb: it worth the expense. You shouldn't scrimp here because you don't want to open it up again just because you want to save a few dollars.

[@harbourwest64]

Awesome Vids donyboy73! good editing, straight to the point, excellent info. Thank you sir!

[@donyboy73]

@davesallotment it may be getting low on compression

[@gavinabcdefghi]

What cleaner did you use and also where would you get replacement diaphram

[@carlylebrewster8010]

dony, great video. I have picked up an identical rototiller as in your demo. So far i have serviced the Carb following your details and have the engine going. Thanks to your video/you. my problem is mechanical at this point ; a worn worm shaft at the points under the bearings and also the shaft bushing and seal. However i am unable to get the unit info. manufacture and model number off the name plate to source parts etc. Wonder if that info.is available off that unit? Hope by a long shot it is. Thanks.

[@MaxuumGreen]

I'd like to start fixing small engines and I constantly have to look for parts..where would be a good place to get parts from? For example I need a set of rings for a 4.5 HP Briggs and Stratton lawnmower engine.. Diaphragm and Gasket for Briggs & Stratton carburetor.. rebuild kits for Tecumseh carburetor.... Where is the best place to get these parts from?

[@snickerstorino]

i have 2 of these that i have been working on. i have cleaned out the carbs very well and replaced the diaphram. it will run for a second then slowly run out of fuel all while surging, if i spray start fluid toward the intake it picks up or can slow down so i think its a fuel issue. however with a cleaned carb and new diaphram what else could it be? the tank is clean also, i was wondering if you have seen any of these pick up tubes start leaking at the top where that black sealant is. also i have been working on a couple other engines as well that have a miss (not spark drop), i adjusted and cleaned all spark components and cleaned carbs very well. one is a tecumseh from an early 90's craftsman similar to the eager 1 series and the other is a 5 or 6 hp briggs on a newer toro. with both these i pulled heads thinking the miss was from leaking compression due to leaking head gasket or bad valve seating. both were full of carbon, i cleaned the heads the best i could. with both the miss got worse after doing this i know one of the gaskets were bad but the other was not. i got a new gasket in for the toro and i am going to try it again. any chance my miss could be related to valve seat issues if the head was full of carbon? your videos have helped me on occasion when i get stumped and are always very informative and i do alot of small engine repair but this is still my weak point is this miss unrelated to spark of fuel. any help on these issue would be greatly appreciated, or at least maybe common issues you have seen that cause a miss unrelated to spark or fuel. thanks!

[@techbill2900]

wyomings elkoholic what happens is the gas tanks warp. you need to check the top of the tank with a straight edge and a feeler gauge. There is a repair its a roll pin and a little round gasket from Briggs and Stratton or a supplier. Doesn't work on pulsa-jet with all temp choke. at 3:54 in the video the hole in the middle of the screen with the little channel going into where the spring for the choke goes is what usually warps.

[@ONEMASSIVEONE]

On mine there is a sixth screw hidden in the venturi about 1 !/2" long.So dont be too hasty trying to force the carb away from the tank.

[@haditwithwork]

Same on mine. Just take a screwdriver and gently push the butterfly valve open and peer way down the carb throat.

[@Singtothetrees]

i have a 3.5 hp briggs and stratton and i did a rebuild on it. and now i lost my spacer for the fuel tank and my carburetor screws. i was wondering if you know a website that could help me get those parts.

[@fredbair]

hi do all the diaphragms have a spring as i have been iven a briggs engine that had problems with the carb,and mine has no spring,it has two plastic snorkels as i call them. ( fuel pickups} and no diaphragm and what looks like a locating pin i will try and post a video of the carb for identity its my first time trying to restore 1 of 3 briggs engines

[@stampysrandomreviews]

Hey donyboy i have done lots of these repairs and it always worked. However ive just done one and fitted new diaghpram and gasget several times but the chamber still keeps filling up with fuel? Any ideas! Great channel Stampy

[@tomlewitt]

The choke spring chamber can fill up , if the tank is very slightly warped in the central area of the gasket. A tiny teflon washer was supplied to help with this. But there should be a small locating pin-dowell at the center (small holes are there for it, ), it's not on many carbs you see ....

[@QUALITY1412]

Is there a fuel shut off valve on this and later 3.5hp classic engines?

[@Guillotines_For_Globalists]

Dony, do you know if there are still carburetor rebuild kits available for this engine? I believe my 2002 Craftsman edger uses the same engine. Really, I only need that paper looking diaphragm for the carburetor. I feel as if that's the culprit because I have cleaned everything else out really well. Same style engine with the fuel tank also filling in as the fuel bowl, with the carb mounted directly to the top of the fuel tank. Thank you!

[@donyboy73]

yes they are still available

[@Guillotines_For_Globalists]

Thanks. Found the diaphragm on ebay, I believe that's all I need. My bet is that is the culprit. Probably my fault for letting the brake cleaner get to it.

[@rosolion]

I have the same carbulator, I need to replace the carbulator kit, did you know the carbulator kit part number?

[@donyboy73]

@raygabmiamizzi thanks for watching

[@donyboy73]

@BeastFromTheEast94 i believe it's an rj19lm by champion

[@donyboy73]

@camry01 at a small engine shop or Ebay

[@donyboy73]

you can use a piece of pipe or go to a small engine shop

[@geojor]

dony, can a ignition coil cause a lawnmower to surge, and eventually shut off when the engine gets HOT?...

[@donyboy73]

@herminator1973 watch all three videos of this repair

[@coaxialgyro]

Thanks for the part number. I've seen some guy reassemble the carb with out the spring, I wonder if it still works ?. Could be worth a try since the spring stretches the diaphram. To think thats the sillyest design you'd expect must have become a mass factory return before even rolling off the shop floor. Mine was used twice, could be the answer for my Mountfileld also !.

[@royramsey6483]

What is the part number for the diaphragm?

[@haydenboyer9193]

I have a engine like this . Problem is the gas tank has a TINY hole. What can I patch it up with?

[@donyboy73]

if you can find an epoxy glue that is fuel resistant it should work

[@haydenboyer9193]

donyboy73 thank you.

[@allenmckinney9533]

Hayden .Boyer JB weld works great for that.

[@brucegrainger7332]

What type of spark plug do you use to replace this

[@donyboy73]

champion J8C OR RJ19LM

[@brucegrainger7332]

donyboy73 Much appreciated.

[@davidturner7960]

donyboy73 I changed plug and did both parts of the repair. The engine fires once, but won't keep running. Is the carb done.

[@Countdown70s]

+David Turner depends...but most likely just needs thorough clean, tank and carb..it is common for B&S engines to start on choke ok, then stall...4/5 times, this is a simple matter blockage which can be cleared fairly simply.

[@yt-djw1419]

hi how can i tell model no 1964 5hp briggs carb manual choke thanks

[@kissingbanditt]

When i prime 2x the gas on my snow blower, i seen gas leak...i opened up the cover thinking i have a broken gas line, which i did not....the gas came out from the opening of the carburator out of a small hole....i watched your videos, does anyone know why this is happening? i heard you say in one of your videos if it is leaking you have to take a gasket out with a wire and face something down..not sure of that name...is that the cause of the leak through the front of the carburetor?

[@wcjcnc]

Hey, Dony, I have an old John Deere 3 Edger. The little metal cup inside the gas tank came loose so I pulled it out of the tank. The short tube on the carb went down into that little cup. Now it won't start unless I prime it with a squirt bottle. Is it because that little metal cup isn't there? what's the purpose of that little metal cup? Thanks!

[@skidmore75]

Am wondering what type gloves you are using? Good idea to protect the hands from absorbing anything that would harm the skin. Congrats on the excellent information you purvey , young lad . I'm a month away from 80 and find your vids are A-one. Tony

[@donyboy73]

yes that would be a problem, you need a new diaphragm and gasket

[@lorenjensen4268]

V can you tell me the carburetor kit number great video thank you

[@stevenpappas8138]

Can you show the location of the linkage springs.

[@donyboy73]

thanks for watching

[@BeastFromTheEast94]

im rebuilding this exact motor, what size spark plug is that? cant find it any where.

[@barbaraharris6273]

i did all that and may mower start but stop because may oil is veryyyy black and it is very hard to take out the nut i can,t do it? thanks for all your videos you are one of BESTexplaining the videos

[@ryry7886]

I watched a briggs and stratton video and they showed you need to pump the old oil out through the dipstick tube and then fill it back up

[@gordwrath6811]

if you still have a carb and fuel tank like this, can you make a new video? I am struggling with mine.

[@sinsagoodmansbrother]

My TroyBilt pressure washer won't start... Nothing at all... Dead?.. The carb linkage doesn't have anything controlling it... Doesn't that control the throttle? Is this automatic?... I'm looking for some springs or hooks that fell off but don't see anything, Also, the choke lever and stop & fast handle don't affect it or make it move. Is that normal?.. I'm taking the carb off now and the bowl is clean?...

[@lynam100]

Doing a oil change on my older brigs and i was wondering what the oil capacity is on these? Is there an easy way to check if its full. thanks

[@donyboy73]

all bgriggs like the one in the video have the parts as in this video. the newer ones didn't

[@geojor]

how do you clean the screens of the long and short tube?...

[@Singtothetrees]

where do you get gas tank spacers for a 3.5 hp birggs and stratton year 1997

[@donyboy73]

@1972FordF150 thanks man

[@Preppyyyyyyyyyyyyy]

where can i get a carb kit for that same carb?

[@donyboy73]

@twaymouth it's normal, u can send me some pics if u want

[@xXunit51Xx]

nice brigg good tips! i got a video out now on my brigg 2hp i have been working on it for like 2 weeks and finaly it runs perfectly!

[@ibbiggs]

do you re-use gaskets after you've disassembled chainsaw engines?

[@meTimetraveler]

GREAT VIDEO, the linkage at 0:58 goes to the governor.

[@donyboy73]

@spiavsspia happy fixing!

[@ChrisTanker123]

do you have a model # or part # so i can track down a carb kit?

[@tellmesomething2go]

Dony. A two gallon dip-tank, with kerosene, is what you need, for cleaning those tanks and carbs. And then a gallon of carb cleaner, with the basket, is good for the carbs. Works wonders. I`m surprised your not using those. Otherwise, nice vids.

[@donyboy73]

@01Carmaster yes chokamatic

[@TheRmyoder]

Great video and narration. I am relatively new to rebuilding engines and this info is very helpful. Also, it is hard to tell from the brief view in the video, but is that an MTD 212-100 tiller? I just recently acquired one (built in 1972) that looks very similar. However, the blower housing was replaced at some point and I cannot determine the engine model. Do you mind sharing your model/type numbers, so that I can use them as a starting point to look for parts diagrams/manuals? Thank you