35 thoughts on “Briggs and Stratton early vertical carb adjustment

  1. Sounds like it just needs a good cleaning and readjustment more than a rebuild. Another possibility is the engine has overheated at some point in its life, or was run low on oil and that scorched the cylinder wall. Try adjusting the loping out using the main jet screw, which should be on the bottom of the fuel bowl. Hope this helps out and you get her running well again soon! Cheers!

  2. I like your video it was very helpful, my lawn mower will start and run in the choke position; however, when i try to take it out of the choke setting the engine cuts out, do you know why this is and how i can fix it, I have cleaning my carb very well i believe. thanks so much

  3. I've got a video posted on setting the governors on the horizontal engines. The same process is used for the vertical shaft engines. Your throttle position is determined by where your throttle cable is clamped in relation to idle position through wide open throttle. The governor only kicks in when there is a load on the engine, so throttle lever position has nothing to do with the governors adjustment. Loosen the cable clamp, move lever to slowest position, pull cable tight then re-clamp.

  4. It's actually quite easy. Remove fuel line, remove nut holding fuel bowl then use compressed air to blow into where the fuel line connects, clean out the fuel sediment bowl (that you removed) then put it all back together. Very little to these little carbs and as long as you put clean fuel in the tank, you should have good service for years. Keep the air filter foam clean and lightly oiled. Replace if the foam starts to fall apart, as the particles of foam can be sucked into the engine. Cheers!

  5. The engine should top out at 3600 or so RPM at wide open throttle, regardless of the cable location, so long as the cable doesn't prevent full range of operation. The governor will regulate the top speed. If you notice, the cable attaches to the assembly, not directly to the throttle arm. This lets the governor do its job without being hindered by the force of the cable against the throttle. Springs between governor arm and throttle are key to proper operation when set right. Cheers!

  6. Man! I really appreciate you taking the time to make this video!!! It helped me understand what I am working with on my Dad's old mower that he gave to me to help with my mowing business! I will be looking for more of your videos in the future! I just can't afford to pay between $45-$60 an hour on labor, but I can always learn!!! Thanks Zippo!

  7. i got the same engine but it only starts on choke, then when i take it off choke it runs for like 2 seconds and then it quits like ur shutting the key off. what could cause that?

  8. I have a Model: 109720 Briggs and Stratton engine it has the same exact carburetor. It is on a Garden Way/Troy Bilt 24" Tuff Cutt. The engine runs good but it leaks gas right beneth the screw that holds the air cleaner in place. What are the possible causes for a leak like this one.

  9. Hi I have a 8 hp briggs like that I thought that the screw underneath the float bowl was to take it off but it is the valve adjustment I was just wondering how far shoukd it be screwed in. Thanks

  10. Very nice video !

    I have the same carburatoe on a 12 HP Briggs, and should be totally off because my engine runs terribly bad…

    You did explain very well, image is great, easy to understand.

    THANKS !

  11. I have a 16 hp B&S cast iron engine.  I am having a problem gettting the high speed side of the carb. to work smoothly.  When I run the mower it is on it does not seem to have much power.  As the blades are engaged the mower gradually looses power.  This motor has been setting for a couple of years and I have new gas lines, changed the coil to a solid state and cleaned the carburetor so the system seems to be in good shape.  Could there be a problem with the valves?  Any suggestions on a solutions?  Also you have great videos and your instructions are spot on!  Thanks in advance for you help.

  12. Hi thx for video , I have the same flow carb but the float is filling up with petrol have you any idea what the part number for a new float would be

  13. Zippo – I tried again tuning the carb., but did not have much success.  I did a compression test and had a result of 120 PSI.  Seems that the valves, piston rings, etc. are good.  I pulled the spark plug and it was cover with black soot.  I have not been able to get the high speed RPM level up.  I probably adjusted the high speed jet to rich, so I took it back to the 1 1/2 turns and started again.  I don't seem to be able to find a smooth high speed.  I did change the coil to a solid state type and was wondering if there is any thing I need to do.  Does one need to change the flywheel for the solid state coil?  Any other suggestion would be appreciated.  Thanks again for your help.

  14. Zippo – I tried again tuning the carb., but did not have much success.  I did a compression test and had a result of 120 PSI.  Seems that the valves, piston rings, etc. are good.  I pulled the spark plug and it was cover with black soot.  I have not been able to get the high speed RPM level up.  I probably adjusted the high speed jet to rich, so I took it back to the 1 1/2 turns and started again.  I don't seem to be able to find a smooth high speed.  I did change the coil to a solid state type and was wondering if there is any thing I need to do.  Does one need to change the flywheel for the solid state coil?  Any other suggestion would be appreciated.  Thanks again for your help.

  15. Hello Zippo! I have watched many of your videos and learned a good bit,so thank you for those. I recently purchased a one owner Big ten in great shape. That being said it does need some minor things. Currently it has a rubber gas line- no filter. I believe they had metal lines with a glass sediment bowl. I would like to put metal lines back on it! Do you have a picture of what that looked like?

  16. Zippo- This might be out of your wheel house and is certainly off topic for this video but I have a riding mower that I'm in the process of turning into a racing lawn mower but it has a hydrostatic transaxle which, when I swapped the pulley on the engine, works great at idle but at idle I can only go 15mph or so and then after I raise the rpm's the pressure in the Pistons of the hydrostatic transaxle and a high pressure relief valve lets the pressure out and I soon am going only 5mph. Do you know how to adjust or close off those pressure relief valves? Because I don't even know where they are and I figured I'd ask around before I took the transaxle apart

  17. great video, much appreciated! 🙂  I just rebuilt one of these carbs (first timer), and it's running really rich.  I wasn't sure which adjustment did what.  Thanks for posting!

  18. I'm really trying to grasp how to do this on my Simplicity tractor so I don't have to send it to a shop. Referring to what I think is the Idle Speed Adjustment screw, you say "turn this in until it bottoms out, and then turn it back in one full turn." But if I've already screwed it in until it's bottomed out, It can't go in any further. What does this mean? Did you mean to say turn it "out" until it's bottomed out?

  19. Hi Zippo, Great video.. I have a 1980's Craftmans 11hp riding lawnmower. It has a vertical carb, just like the one in the video. My carburetor is leaking gas.. When you look at the carb from the top without the air cleaner.. You will see 2 holes. The first hole is where the long screw for the air cleaner screws into. It's leaking from the 2nd hole.. From the bottom it looks like wire mesh, maybe to catch any dirt in the carb.  Please help..Mike

  20. Great video, Got a couple of questions, I have a 68 simplicity 3012 and a 68( i think) A/C B 110 and they both have the same carb on them looks like a one piece jet-flo The jet does not come up through the float. I took one apart because of a leak and now want to rebuild both of them but I guess I'm just missing something, everything I see said the jet has to be removed to get the top off but mine doesn't, Got any ideas? also everyone wants the model and serial number of the motor but I can not find them on ether one, where are they found? thanks

  21. thanks for the tips – I had my idle and high speed mixture confused – this was timely now mower runs well and hopefully will sell it tomorrow!

  22. I have the same carb and mine has a manual choke on it.. The only way it runs is with the choke Closed shut..I think its time to rebuild its off a 1989 White cruise-a -Matic riding mower 12 hp I/C..It set up for awhile and im still working on it..

  23. So I bought a new carb and switched the ignition over so I don't need the points anymore. And the engine runs now but over revs dangerously high ever since and I can't figure anything out. Can you watch the video I just uploaded of it over revving and help me? Thanks

  24. hi i have a 11hp briggs and stratton with the same carb but the spring on the throttle link is broken ( the one from the carb to the black throttle box on the side of the engine) how does the spring hook up on the engine and the box ? thanks

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