How The Auto Choke Works On A Briggs And Stratton Lawnmower Engine #briggsandstratton #lawnmower

I was working on this old Toro lawnmower today and a youtube video opportunity presented itself:

How the Briggs auto choke works

Watch this video if you want to know how the auto choke on the Briggs and Stratton lawnmower engine works. Back in the day some machines had a choke lever, but nowadays it's a primer bubble or the autochoke system. Honda and Kohler have a similar apparatus, I'll do a video on those in the future.

Sometimes if your auto choke mower won't start when it's hot or cold, this could likely be the problem.. This could also be the cause of the dreaded lawnmower starts then dies scenerio.

Craftsman push mower replacing the vane spring
Craftsman mower won’t start
Replace broken or missing vane spring explained

#diy

[johns.]

You wouldn't believe how long I searched for a video to describe this apparatus! Fantastic and thank you!

[thejonfedor]

SO interesting! I just replaced the carburetor in my Briggs with the same engine and did a bunch of searches looking for this exact information. Thanks tons for the compact, detail-oriented explanation - I learned a ton!

[EJK]

Goodness! You solved a week long headache for me. My dumbass threaded the control arm THRU the therm arm.... watched your video and within 10 min had it all working right again. God Bless youtube mechanics!

[victorbertolina]

Had the problem where mower would not start without a bit of gas squirted into the carb. The carb was cleaned and appeared to be working properly but I noticed the choke plate was not closed when the motor was cold. I removed the flywheel cover and found a tiny twig had jammed the auto choke lever in the open position. Upon removal of the twig and reassembly, the engine started normally. Thanks for the video!

[radiofhi]

Thanks for a clear and accurate description of the carb spring/auto choke operation on
this engine. It helped me troubleshoot and repair my B&S engine. I'm grateful and once again mowing grass!

[ThomasMiller-hykl]

It may have been three years ago you put this out but my goodness you have helped me out with my lawnmower today July 27, 2024 excellent tutoring about the lawnmower thank you very much. God bless.

[will_cal]

I have been searching for something to explain what the heck was wrong with my mower for ever! I went a full season without a dang vane spring! This video just saved me so much money!!!

[adrisanc]

I found one of these with the bagger 3 houses down, it was ready to be picked up by the garbage man, but I ran over to get it. Took it apart as it looked like they had attempted a repair on it. Went through it and followed this video on how the auto choke worked and found it was not put back correctly. Thank you so much for this informative video!

[davemellon]

thanks a lot. I just ran into a issue just like this. I just replaced the carb. and still was starting then stopping. while I had cover off I started mower and pulled the choke lever a little and it stayed running. after a few stops and starts it runs no problem. if happens again ill know what the issue is thanks to you. that thermometer lever might be sticking.

[shadovanish]

This is an example of what I dislike about modern small engine carburetor control designs; complex & unreliable system that wasn't designed for the "real world", & designed by someone who apparently has no concept of "real world" conditions. The older manual choke operating system seems much more robust & reliable, & easier to fix (usually with only minor cleaning). This "removed from reality" design mentality seems to apply to many modern machines.

[francescobarioli]

Really well done. Understanding how things are supposed to work is the best approach to fix them.

[cheaphacks]

I have been searching high and low for this video! I have this exact model that I purchased used from a young guy who was tinkering with it. It would run but only have 10 pulls starts then it would die. Then 10 more pulls starts and it would run but at a rough idle. After watching this video I can now see the mower is missing the top spring. 🤦🏻‍♂️ thanks for making this video!

[philang.]

Thanks…..my craftsman was very hard to start, thought it was the carb, but the thermostat arm wasn’t moving smoothly, blew it out with air and lubed it with dry graphite spray. Works great now, almost junked it!

[FreemanEdeh]

Excatly the explanation I needed. Also, explaining the 3 different choke systems was helpful, too.

[Phillip-iq]

I barley started messing with engines and i had lost the spring and couldnt figure out how it was supose to go other than screwing into the carb, thanks for this info video

[johondarr]

Here we are, one year from the date of this video and your still helping people! Thank you so much, saved me hours of research and solved my issue with my mower.

[CA-UA]

Very helpful video. In my case, I took everything apart and found a densely packed mouse nest with the occupant jammed into the far end of the lever by the thermostatic thing. It would move toward full throttle but then back off and sputter when it hit Mr. Mouse.

[tiz]

Thanks. Just the information I needed for the auto choke device on my mower. Now I can see how it all works together.

[LawnMowersThingsThatMakeNoise]

One of the best explanations of the auto choke !!!! Thankyou 🙂

[DS-bifz]

this is just enough detail and quick too - I went searching to understand autochoke, found this, have my answer