The float valve in the bottom of the carb. you remove the bowl and you should see the float there's a pin that holds it remove the pin and the float and needle valve should come out check for wear or for something in the orifice clean and reassemble
SOURCE: I have a simplicity model 4211 lawn tractor with no spark.
terry, check for kill line on motor to see if grounded out,you can remove from ground clip.
also you say you checked points??????
check for flywheel to coil pickup clearance .
point type coil to flywheel the airgap should be 25- 1000ths with feeler guage. on electronic ignition coil to flywheel pickup the air gap should be set @ 10-1000ths with feeler guage. hope this solves your problem..........lemmee kno.....chris
SOURCE: Craftsman Lawn Tractor/ hard start/ whitish smoke
does it turn over slow or fast if it turns slowly thats the problem so it could be battery or starter they have to have a good amount of rpms to burn fuel right when starting if not it floods out the engine with gas hope this helps thanks wade
SOURCE: MTD lawn tractor. 16 hp twin briggs straton
THIS SOUNDS LIKE A THROTTLE CABLE LINKAGE PROBLEM.WITH THE HOOD OPEN AND MOTOR RUNNING RUN YOUR THOTTLE UP AND DOWN WHILE LOOKING @ THE LEFT SIDE OF THE MOTOR TO SEE IF THE CABLE IS FROZEN IN PLACE OR BROKE OR DISCONNECTED .HOPE THIS HELPS
SOURCE: Walbro Carburetor on Briggs & Stratton Model 28R707
If the float don't float, the needle valve stays open and gas runs into crankcase.
If float floats (has no gas inside) then the needlel is probably worn and needs replacement.
SOURCE: i have a Briggs and Stratton Model 28V707 on a
first check to see if fuel line switch is off located on the side of engine then take the carb apart and soak it in a carb cleaner sold at your auto part store soak
n a carb cleaner for appro 2hours then rinse with water then dry put it back should work fine the carb is clauged
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