How to Clean a Lawnboy Carburetor 

Excellent video. You went above it precisely as it should have been done. No corners cut. I love that.

Yesterday I decided that my Model 10525 had sat in the shed long enough. Last time I tried to use it I had to leave in on partial choke because it was surging. At the time I didn’t know that this was a common problem. Then I got a riding mower and the Lawn Boy sat. For 16 years. So last night I watched this video and today I cleaned the carb and spark plug. The silly thing started on the second pull! THANK YOU!

Excellent video! One thing I’ve done to two of my Lawn-Boys is cut a piece of foam off an old air filter and put it in the primer bulb. That helps block dirt and dust from another path to the carb. I have a 1973, 1975, and 1987 Lawn-Boy and they all fire up on the first or second pull, and I still use them to mow weekly.

The best video on this carburator. Well done!! I am hesitant in using in other oil mix other than 32:1. I rather now my engine is getting proper lubrication. Love the video, clear and to the point 👉.

Excellent video, without a doubt one of the best I have seen regarding this mower. Great job!

Great video! Got my mower running again! Many thanks!

This video cleared up my surging problem! Holding the filter box to the carb allowed me to see how it all worked together. Great teacher and at just the right pace.

I picked up a free lawnboy with the carb disassembled, this was a huge help, thank you much for the well made through video, it was a huge time saver and I learned a lot as well! Nice work Man

And again, tonight I picked up a similar model Lawn Boy by the side of the road. This video will be helpful for repairing this one as well. Thanks!

Great video by the way! Thanks for creating very thorough content. Aside from not knowing how to read and adjust for compression, pressure, etc this fixed my machine that was acting up rough 15 years ago so I left it alone. After cleaning out the carb, it started on one pull! Hasn’t been used in 15 years lol

I've been dealing with a surging Lawnboy Duraforce lawn mower for quite awhile now. Mine surges as soon as it starts up. It calms down after awhile but when it first starts up, I need to keep pressing the primer bulb once or twice to keep it going. I just came across your video and decided to give the micro drill bit into the pilot jet a try. ordered the bits today and they should be here in a couple of days. If I can come back to this post, I'll update on the results after I ream the pilot jet out a little. Thanks... Steve in Central Vermont

This is one of the best instructional videos I have every seen. Great job.

one of the truly good lawn mowers.

I’ve worked on around 40 lawnboys since this video and 50:1 is definitely the perfect mix. All of the ones with 32:1 have smoked and the spark plug was carboned up. Also have seen lots more of carb problems due to that.

I had been using opt1 synthetic mixed at 50 to one. I was mowing the other day with a 10550 and it threw a rod and destroyed everything. Punched a hole in the case. It was running perfectly up to that time. Since then I have changed to 32 to 1 on the donar engine I installed. I have had others tell me that the Duraforce runs hot and needs the richer mix to help cool. On the other hand the dealer that sold me the opti 1 said I could run 50 to 1 in anything , and I have. Chainsaws, trimmers with no problems. This was the first time I had an engine blow on a mower. So to try and be safe , I'm using 32 to 1 on the Duraforce.

Great tip on the primer bulb installation i expect a lot of people have had issues installing these primer bulbs without using your ingenious tool selection.

Great video! I've ran the piss out of mine for 17 years. I've cleaned the air filter like every 3 years and only changed plugs twice and a coil once or twice. It still starts every time. Did make sure to break it in slowly when new. Just bought a "parts" mower with a super nice deck and swapped the engines. I'm going to clean the carb and put a fuel filter on it - Nice demo on t Also, never hear of a "Jerry can"....??

Excellent complete video including part numbers used. Thank you for such a helpful video.

Excellent video. I also use the 50 to 1 mix and have had no issues in equipment from my shop. Thanks for the video's.

To aid in reassembly: Saw a screwdriver slot in one end of ONE piece of one inch long1/4-20 threaded rod. Screw it into one mounting hole about 1/4 inch. This allows you to hang the aluminum plate in position on the stud while installing one of the mounting bolts. Remove the rod and install other mounting bolt. An option is to also glue the aluminum plate and a gasket in position.

great tip on using the wing nuts to hold the carb to the air filter.

I love the way he explains things. Definitely explained everything I need to repair my Lawnboy. Mine leaks fuel through the carb when not in use. Even leaks some fuel into the crankcase.

nice trick with the pilot jet, that heiped my surging problem, thanks.

I want this guy to fix mine. Well done.

I know this is old, but it has some really good info on these old beasts, thanks a bunch brother, just what I needed, very informative and well produced!

Great video ! Cool to see your gauge indicate the leaky needle and seat . 👍

Excellent video. You are a natural. I learned a lot.

Thanks for the video…have a customer dropped off an abandoned one. They replaced the carb and it won’t rev up. Been sitting in my yard for over a year. Got it running with a Huff of GoGo Juice, Fresh Fuel and Seafoam. Only way it Rev up is if I push the buttery flap. Now I know how that spring is routed…pray for me I can get it to work lol

Never thought about using wingnuts to hold the entire setup together. Might have to try that if I get another lawnboy that has a throttle setup.

Great job! Very helpful. Thanks.

Subcribed. Clear, perfect instruction.Thanks.I did on my Lawnboy 10323

The foam air filters don’t meed to be replaced unless they are absolutely disgusting or are disintegrated. All you have to do if rinse it under warm water, put some dawn dish soap on it, rub it about, rinse and let it dry in the sun.

You just helped me find the correct air filter. Thank you

Excellent! Thank you for doing what you do! You dont have a single father or grandfather do you?? lol

Thank you for the great video. Had to watch it a couple times was wondering whether that pilot jet needed to be covered up like with the original decal. Keep up the good work.

Thanks. Very informative.

I have a Lawn Boy Gold Series model 10546. the mower starts and runs great when it is cold but if you run it for a while.. 2-5 minutes, and then shut it off it wont start again until it is cold. Any ideas??? BTW.. I have cleaned the carb, replaced the primer bulb, changed the spark plug, and put new gas in it.

Little late to the party, but good video. Picked up a couple good pointers. Well done

From the factory the inlet seat washer is not there, Toro used Loctite 515 gasket maker to seal the threads (and also around the pilot jet). Either method works, but that is why the Toro needle kits don't come with the washer - they expect you to use sealant.

Thank you so much. Really helped!

Funnily enough, these are the exact engines used in the Toro CCR2450 and CCR3650s before Briggs and Stratton bought out Lawn Boy's engine division. Those ran at 50:1.

Very good explanation love the video ty Ps I also subscribed

excellent vid.

great vid, gonna go fix mine now

Great video 👍

Is there a reason that you don't add a fuel shutoff valve in addition to the inline fuel filter?

Using an ultrasonic cleaner to clean plastic Lawn Boy carbs, do you use any heat at all or a low temp? What is the temp you use? Sorry if I missed it. Thanks

Awesome video thanks so much! I think I just need a bowl gasket on mine but I appreciate all the info. Btw do people really put carburetors in the dishwasher? Lmao I believe it

Good job

I recommend the Sunoco 32:1 pre mix gas.

Hello. I have a lawn boy 2 stroke dura force silver series. Does at half and full throttle after a couple mins. Any ideas

Good day Interesting video. The float was that a normal color? Yea yrs. ago I went with heavier oil mixture, until I bought Sthil whipper zipper & was told 50-1 is good enough. Thanks

Can you use brake cleaner instead to clean out the carb base? Any downside?

is the a hole in the side screw that needs to be pocked out ,(clean)

Id like to get a 2cycle lawnboy one reasone is you never have to change the oil only when you get a new can of gas and oild

Do you happen to know the factory rpm setting/notch on the air vane? If you have time would you be able to make a short video on the spring linkage to the air vane? Love your vids, thanks for the great content!

Can you tell me how to adjust the top spring tension as I had to replace the spring ! Regards

Great video. My issue, I've just replaced both the ignitor and the carb, also adjusted the throttle cable. However, when I try to start the mower, it just runs for a few seconds then dies out. What could be going on?

Would you have any suggestions for me if I told you I was having a hard time getting the bolts to retighten? I still have slack in the assembly, but the bolts feel as if they are maxed out when it comes to tightening. Possible thread issue?

You didn't mention anything about oiling the filter either

What’s a great online vender to buy these parts OEM or AM types. I need to buy a new choke throttle cable. Mine got pinched from folding over. Great machine. I bought two of these 20 years ago. I’m on the second one after using for 30 min it’s been in storage. Can’t get it to start lol. Been sitting a tad too long. Best mowers I’ve used. Not sure what to do if I need a new one that’s comparable to these beasts. I’d mow for hours and hours. Never ever had 1 issue ever.

Thanks for the awesome video! So we can order parts from you?

Do the lawnboy 2 stroke air filters get oiled or not?

Any idea where I could get a carb kit for a Lawn-Boy model 10324 with a model 98-7042 carb? I've done some looking and that carb is now obsolete and a model 107-4607 carb is being offered. I would prefer to rebuild the one I've got instead of buying a new one.

What size wing nuts do you use?

What type of vacuum gauge do you use? Also the part number for the inline fuel filter. Thanks Richard

Where can I get the micro drill set?

Excellent!

I noticed you have a hole in your throttle plate. This hole is not from the factory, but rather a surge fix, along with a Briggs pilot jet. I wish you would have spoken of that.

Will 32 to 1 work in this lawnmower?

Plastic carburetor jeeeezzzz, what will be next ? Plastic crankcase?

so, what oil do i start using ? i use 91 octane in all my small engines now. no ethanol . 50:1 mix. can i use sthiel can fuel ?

👍

What size are the wing nuts you used to hold the carb together? Thx

My 10515 lost 3rd gear and is losing 2nd, with a rhythmic grinding preceding loss of gear. It still runs fine in first, but shifting is a bit stiff. I figure this is either a slipping pinion gear (in the trans, not the wheels) or shift keys, any idea which is more common or more likely? What are the most common and likely failures in the Lawn Boy 3 speed gearbox?

Wow. The full service probably cost more than the value of the mower. I find those online for under $100 quite often.

Got my carb all cleaned up and everything is back in place but I dont have any throttle control other then choke and wide open. When I move the throttle from choke to fast, the butterfly opens wide as it should but when I go from fast to slow, the butterfly doesn't move. Cable was adjusted as per your video but the only way I can use the mower is to run it partially choked, otherwise it turns about 10 grand!! lol Any clues?

Um no i run them at 32 to 1 if i run them at anything less they ping and start knocking i never run my lawn boys at anything less then 32to1 actually i now run everything at 32to1 even my sthil 024 chain saw i never have an issue

Hy. y just buy one like this. it did not start. i cleaned carb and dii not want to start. adding fuel in the motor will start, so y take a look at crank seal :( FAIL) broken crank seal. Im in Montréal. can y still get parts for this

Gas cap says "32:1" but you talk about making a 50:1 ratio for fuel......why is that? I have the same mower, wondering if that would make a difference with the engine performance.

👍 🙏

😂 that is not a Styrofoam float...it's cork....

Why did you not just not replace the spring? It's clearly stretched

I greatly disagree with your comments about using 50:1 fuel in that engine. Many years ago (30?) I had a service person try to convince me that I could use a 40:1 fuel/oil mix in my 16:1 (1968) LawnBoy. Not being convinced I managed to have a phone conversation with an engineer at OMC. The engineer told me that what determines the amount of oil you need to use is the metallurgy of the cylinder, the metallurgy and number of rings on the piston and the the metallurgy and design of the needle bearings. The engineer stated that my 16:1 engine would always need a 16:1 fuel/oil mix. The 40:1 label on the oil was more or less a rating of the quality of the oil in that this oil could be diluted to a 40:1 fuel/oil mix and still provide good lubrication for an engine designed to run with a 40:1 mix. Older 16:1 or 32:1 oils could not be diluted to 40:1 and provide good lubrication to the new 40:1 engine. So I call "bogus" on your assertion that a person should run a 50:1 fuel/oil mix in a engine marked as needing a 32:1 mix. Maybe a person could get away with a 40:1 mix in that engine, using new oils, but I would never use a 50:1 mix in a 32:1 engine.

Tried everything: cleaned out the carburetor, fuel lines, replaced spark plug and filter, sprayed carb cleaner and starter fluid; still wouldn't start. Done with gas mowers.

what size wing nuts do you use?