Inlet Seat

Remove the float bowl. Then remove the pin from the float. Drill a little larger hole in the inlet seat then screw in a self tapping screw then pull inlet seat out. Tap in the new seat with a brass hammer. Then simply replace the float needle valve. Place the pin and float back in. Clean out the float bowl and attach it to the carburetor.

1. Drain gasoline from tank and all oil/gasoline mixture from crankcase. Drain gasoline by disconnecting line at fuel filter. Remove fuel filter.
2. Remove air cleaner housing. Disconnect from tube to crankcase breather.
3. Remove sediment bowl and float valve & needle from carb. First drain gasoline by loosing bowl screw one turn. Check float to be sure it has no gasoline inside. If so, it has a leak and needs to be replaced.
4. Remove carburetor - no need to remove manifold from engine. Note how throttle and choke linkages are connected to carb.
5. Remove breather (behind carburetor) and gasket.
6. Take carb to bench - Tap old pressed-in seat with 1/4" tap. Remove seat, using puller made with 1/4" bolt, nut, washer and socket.
7. Remove idle mixture screw.
8. Remove atomizing nozzle using narrow blade screw driver.
9. Clean carburetor and nozzle with carb cleaner. Ensure all passages clear and blow out with compressed air.
10. Put in new seat. Pound in lightly using smooth end of socket extension or small block of wood and hammer.
11. Reassemble carburetor with following new parts in addition to seat: float needle, idle mixture screw (with slotted head) and bowl gasket.
12. Put tube to air filter in a new breather assembly and install assembly on engine with new gasket. carefully scrape off any pieces of old gasket to get clean smooth surface.
13. Attach throttle and choke linkages to carburetor. Will have to tilt and twist carb to do this.
14. With intake gasket in place slip bolts through carburetor and holes in gasket and attach carburetor to manifold.
15. Install new fuel filter in line and attach line to carb.
16. Put new air cleaner in air cleaner housing and attach to carburetor using new Seal-O-Ring gasket.
17. Attach breather tube to air cleaner housing.
18. Put in new spark plug set to proper gap.
19. Make initial setting of carburetor idle mixture screw to 1-1/4 turns back of "soft" bottom.
20. Fill crankcase with oil to proper level.
21. Put small amount of FRESH gasoline in tank.
22. Start engine and make final adjustment to idle mixture screw.
This repair has corrected problem.

1. Removed carburetor.
2. Unscrewed bell to expose float and needle valve.
3. Removed float by sliding out pin.
4. Removed needle valve.
5. Removed brass seat by tapping with 1/4" tap, inserting bolt, and pulling out with press.
6. Lightly tapped in new seat.
7. Replaced needle valve, float and bell gasket.
8. Reinstalled bell.
9. Reinstalled carburetor.

I noticed a small puddle on the floor. It was oil and gas mixed. Then I checked the oil level on the dipstick and it was way over full and smelled like gas. After some research I found out that the Briggs & Stratton engines (mine is a 18hp Intec) are known for the needle valve in the carburetor to go bad. The reason is that the tip of the brass valve is rubber to make the seal. Also make sure you replace the seat that the needle valve goes into because it will be worn too. A 1/4" tap fits perfectly into the seat. thread it down (carefully) and stop as soon as you feel it bottom out. I used a 5/16 socket that I drilled out so the 1/4 - 20 x 1 1/2 bolt would fit through it. Then sit the 5/16 socket over the seat and place a washer on the 1/4-20 bolt and thread into the old seat. This works as a puller and will lift the old seat out. Note: check the old seat before pulling it out to see how much protrudes out of the hole. To install the new one put a little oil on it and place it straight in the hole and use that same 1/4 - 20 bolt with a nut on the end now to drive it into the hole. Don't forget to make it the same protruding out as the old one. Reassemble the bowl on the carburetor and your done. Take your time and the repair will go pretty easy.

Removed carburetor float bowl. Pulled float off, and replaced needle valve

remove carburetor and float bowl and float and needle valve tap inside of seat in carburetor with a 1/4 twenty tap then threaded bolt in and then pulled out old seat and then tapped in new seat with a punch until it hits home at bottom reassemble carburetor and put back on engine

I removed the intake and carburetor it was easier to do that instead of just removing the carburetor. i then removed the carburetor bowl. i took out the float and needle. I used the 1/4" tap to make threads in the seat and then used the screw washer and tubing to make a puller to remove the seat. I then replace the seat put in all back together and now the mower runs like new again.THANKS

Removed the carb and replaced with the new parts. Installed carb back on the unit.