Return to the Lawn Mowers Forum | Post a Follow-Up

 o
20 hp Briggs

Posted by FredFuentes Florida (fred.fuentes@att.net) on
Fri, Jul 11, 14 at 16:11

I just finished mowing our back yard[ appox. 1/3 of an acre. After a cooling off time, Tried to start and park in our shed. It would not hit a lick. This mower is 12 years old with no former issues. I next drained the fuel, changed the plugs and fuel feed line. The eng. continued to flood on start attempts. Changed the needle valve, inspected the seat. The float is plastic with no fuel inside. My owner manual shows a picture showing how to adj. the carb. It also shows the fuel pump[ with thee screws] mine has four screws. It also has a non adj. idle mix. jet, mine just has a hole. I checked with our local mower shop and they advised me to plug it, I did no help. Now after checking the needle valve again, it started up but before reaching on speed the remote throttle control linkage moved to full throw???? What controls the remote linkage ? The rigging seems to meet the specs. in the picture. I spent 50 years fixing air plane engs. but this has me baffled.


Follow-Up Postings:

 o
RE: 20 hp Briggs

Well, the linkage is controlled by the governor. It sounds like that you are working on an opposed twin from your carburetor notes. Some 4 screw models have a removable fixed jet and some just have the well, but nothing else. Is the engine still flooding? I assume that the proper needle valve /kit has been installed or was there a question in that regards? Seats are available as well if needed. Model and type should you need more info. Part numbers that you have installed could be helpful too. And be sure that if fuel had entered the sump to change the oil also.


 o
RE: 20 hp Briggs

Thanks for you input. The engine is a Briggs& Stratton Mod. 461707 installed on a Garden Way with 46" blades. Carb. p/n 692815. The needle valve I installed was p/n 808798. The local mower shop says on this model the seat does not require changing. Yes it foods every time. The only other thing which may have an input, was after I mowed, I used the mower to blow away leaves to the back fence. The leaves were blowing everywhere. When I checked the intake filter , it was covered with leaves.Is there something which could be plugged up? What does the governor monitor, crankshaft RPM? Is there some way to check the governor? I also checked the flywheel keyway and the spark plugs for fire.


 o
RE: 20 hp Briggs

Well, the governor isn't causing your flooding issue. With the price of the complete kits vs the needle that you installed- they should have sold you the whole thing. I assume that you used the gold needle of the two? Seats can wear. Especially if the fuel tank is under the hood, the fuel pump may contribute to the flooding. True a plugged bowl vent can also, seems unlikely. In an odd case, sometimes the needle doesn't hit the center of the seat right away after service. The pump fills the bowl and keeps filling. Sometimes a tap on the front of the carb body as you begin to run it up will let it find its spot. Sometimes we also take for granted that a plastic float will always pivot on the pin. Just be sure it does.


 o
RE: 20 hp Briggs

The needle valve cost $22.00. Received two valves, one long [ which is too long] and one gold short. Where does the bowl vent? I can not get it to run to try the tapping but will try some way to check this info. Thanks, Tom. I will again check with our local shop about the seat.


 o
RE: 20 hp Briggs

The needle valve cost $22.00. Received two valves, one long [ which is too long] and one gold short. Where does the bowl vent? I can not get it to run to try the tapping but will try some way to check this info. Thanks, Tom. I will again check with our local shop about the seat.


 o
RE: 20 hp Briggs

$22 for a float needle? Good gosh, they saw you coming. Try running it without the air filter, a plugged air cleaner will certainly cause flooding but not gas running out of it.

I would install a gas line shut off valve and use it when not running IF the gas tank is higher than the carb.

Walt Conner


 o
RE: 20 hp Briggs

The reality is that the little float valve pack is that much and the whole kit complete w/ pump is another $10-15. Why they choose to package these two needles together makes no sense. I think the long needle is fits Vanguard engines. You will detect the bowl vent as you clean the passages in the body and top.


 o
RE: 20 hp Briggs

I don't work on this every day, but I decided to check the compression, using the thumb method.The two cyl. seems equal. I noticed the liquid in the intake manifold. It was a little brown and smelled like fuel. I checked the oil dip stick, and again it smell like fuel???


 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!


Return to the Lawn Mowers Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.


Learn more about in-text links on this page here