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Walbro Carburetor on Briggs & Stratton Model 28R707

Briggs & Stratton 13.5 hp (Model 28R707) and Walbro carb - fuel is draining through carb into crankcase

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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.

Posted on Sep 30, 2009

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Check floats if ok check needle valaes and seats

Posted on Sep 06, 2009

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Posted on Jan 02, 2017

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In this video I will show you how to clean the carb on a Briggs10hp. This is a Nikki carb.

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Will not start. but if I pour gas in carburetor it will. stop after the gas is burn of carburetor


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1 Answer

Dersoj@bellsou5th.netI have a Walbro "49"


Look on your carb and find out which of these numbers is stamped on it:
CAA
HD
HDA
HDB
HDC
LMB
LME
LMG
LMH
LMJ
LMK
LMR
RWJ
SDC
WA
WB
WG
WGA
WHG
WHL
WIP
WJ
WLA
WPF
WS
WT
WTA
WTE
WTEA
WY
WYB
WYF
WYJ
WYK
WYL
WYM
WYP
WZ

If you provide your engine model number I can find the diagram on your carb and figure out where the coned shaped rubber piece is to be installed.
Kelly

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2 Answers

Its a briiggs and stratton 16.5 hp model #313777 0112-E1. I'm gettin gas in my oil and am pretty sure float is sunk and it won't start at the moment. The carb bowl spins clockwise and counterclockwise but...


You need to determine if you have a Nikki or Walbro carb. The Nikki bowl is held on by two phillips head screws and the Walbro bowl is secured by either a single bowl nut or a anti-backfire soleniod (two wires going to it). Your problem is probably the seat in the carburetor. We see very few float problems since most of them are plastic.

If you have a Walbro with the anti-backfire solenoid you will need to get a slim 1/2 open end wrenc the access the "flats" on the solenoid to unscrew it.

The brass seat is replaceable in the Walbro along with the needle. If it's a Nikki, you may need to replace the carburetor.

Hope this helps

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2 Answers

I have briggs and stratton powered mower with the 18.5 v-twin ohv intek engine modle 407777 type 0121-E5 CODE 000512ZYG MY PROBLEM IS THAT MY CRANKCASE IS FULL OFA GAS OIL MIXTURE THE OIL FILTER ALSO...


When the float in the carb sticks, it allows fuel to drain into the cylinder, that runs pass the rings into the crankcase. When the crankcase is full the pistons cannot go down, and the starter won't turn the engine. Drain all the oil gas mixture, and refill with proper oil. Replace float, needle and seat in the carb bowl. Throughly clean fuel passages, and bowl. If motor won't turn, remove spark plug and turn over engine a few times to remove gas oil mixture from the cylinder too.

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Briggs & Stratton Van Guard 16 hp D.C. Chipper with Gravity Flow. With fuel switch on and starting engine four minutes, white smoke apprears and increases gradually, then heavier and chokes itself...


Sounds like your carb is flooding. Inside the carb, there is a simple valve that shuts off the fuel flow when the fuel bowl is full. If this valve fails, or if the float sinks, then too much fuel is forced into the cylinder and will wash past the rings and into the crankcase. This causes the engine to run very rich. You need to remove, clean and overhaul the carb, and change the oil and sparkplug and probably the air filter too. Find the model, type, and code numbers on the engine and go to www.partstree.com , www.ordertree.com , or your local repair shop to get the needed carb overhaul kit. Some B&S engines have an option of carbs, so look for a name on the carb itself...probably Nikki or Walbro. The carb kit is not very difficult to install, but make sure to get everything very clean before reassembly.
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