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briggs and stratton push mower engine

#1

A

ACF

i have a push mower with a 5 hp b/s engine that will not start unless you use starter fluid. i have clean carb replaced primer bulb, air filter base plate, did not resolve the problem still needed starter fluid, so replaced carb, this did not reslove the problem still need starter fluid to get running once running it runs good. any clues as to resolve this problem.
thanks
AC


#2

R

Rivets

Please post model, type and code numbers for the engine. We are not psychic and hate guessing as to which Briggs engine you are looking at.


#3

A

ACF

b/s 4.75 hp
model 12L902-0667-E1
serial 0603165


#4

R

Rivets

With that carb I’m inclined to say your float needle seat has swelled causing a lean starting condition. Recommendation is to remove the carb and replace the float needle and seat, and make sure that you set the float to the proper level.


#5

A

ACF

installed new
Rivets said:
With that carb I’m inclined to say your float needle seat has swelled causing a lean starting condition. Recommendation is to remove the carb and replace the float needle and seat, and make sure that you set the float to the proper level.
Click to expand...
installed new carb same problem


#6

R

Rivets

Did you purchase the new carb off Amazon or FleaBay. If so I would not be surprised that your carb is not good. I always recommend buying OEM from a reputable dealer. My recommendation to you at this point is to take the float bowl off the old carb, tip it upside down and see it the float is either level or slightly down on the side opposite the float pin. If it is I’m wrong, but if it is higher on the opposite side you have a swollen seat.


#7

C

cubs fan

[ATTACHREUSE]
check your filter base to see if the primer is working

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#8

S

slomo

ACF said:
i have a push mower with a 5 hp b/s engine that will not start unless you use starter fluid.
Click to expand...
Indicates. most likely a fuel delivery issue.
ACF said:
i have clean carb replaced primer bulb, air filter base plate, did not resolve the problem still needed starter fluid, so replaced carb
Click to expand...
Did you install new carb gaskets? Over torque the carb mounting screws or air filter base plaste with your impact gun? Check for vacuum leaks?


#9

C

cubs fan

the next question, if it runs smooth and easy after spraying starter fluid. Sometimes you can find a two cans special at NAPA for starting fluid.


#10

StarTech

StarTech

Even with a new primer air base you can still have priming problems if it is not sealing properly to the carburetor. Check the gasket impression as to where there is no contact. ANd don't over tighten to screws as they can warp the plastic base.


#11

S

slomo

StarTech said:
Even with a new primer air base you can still have priming problems if it is not sealing properly to the carburetor. Check the gasket impression as to where there is no contact. ANd don't over tighten to screws as they can warp the plastic base.
Click to expand...
True true true.....

Try two gaskets if one doesn't get you priming.


#12

K

kjonxx

Check valve settings


#13

Z

Zedo

ACF said:
i have a push mower with a 5 hp b/s engine that will not start unless you use starter fluid. i have clean carb replaced primer bulb, air filter base plate, did not resolve the problem still needed starter fluid, so replaced carb, this did not reslove the problem still need starter fluid to get running once running it runs good. any clues as to resolve this problem.
thanks
AC
Click to expand...
On a cold engine the carb throttle plate needs to be closed ( butterfly) Once the engine warms the throttle plate will open up and if you shut it down while hot , you should be able to start the engine w/o the carb cleaner.
If it doesnt start when it's cold and you need the carb cleaner to get it going, I would check the linkage going to your carb, may be hung up on something or needs adjusting. Take off the
air filter cover and look to see if the butterfly is closed when engine is cold ( you might have to take of the stationary cover that holds the air filter in to see better. ) You dont have a spark problem or a fuel problem or an air filter problem ( unless you have very old gas ) get fresh gas.


#14

G

Gord Baker

ACF said:
i have a push mower with a 5 hp b/s engine that will not start unless you use starter fluid. i have clean carb replaced primer bulb, air filter base plate, did not resolve the problem still needed starter fluid, so replaced carb, this did not reslove the problem still need starter fluid to get running once running it runs good. any clues as to resolve this problem.
thanks
AC
Click to expand...
Quite possibly it needs a Carb Gasket kit. Is the fuel tank beneath the carb?


#15

chuckpen

chuckpen

your starting fluid is just taking the place of what the primer bulb is supposed to do. You should be able to see the squirt of gas when you press the primer bulb. with the airfilter outside cover and the air filter removed, take a look inside the carb throat to see (or not see) the gas squirt. I would bet on a bad / incorrect / poorly placed gasket that would cause the prime gas "circut to not work, maybe the bulb.


#16

1

1-Feather

ACF said:
i have a push mower with a 5 hp b/s engine that will not start unless you use starter fluid. i have clean carb replaced primer bulb, air filter base plate, did not resolve the problem still needed starter fluid, so replaced carb, this did not reslove the problem still need starter fluid to get running once running it runs good. any clues as to resolve this problem.
thanks
AC
Click to expand...


#17

1

1-Feather

Gord Baker said:
Quite possibly it needs a Carb Gasket kit. Is the fuel tank beneath the carb?
Click to expand...


#18

1

1-Feather

chuckpen said:
your starting fluid is just taking the place of what the primer bulb is supposed to do. You should be able to see the squirt of gas when you press the primer bulb. with the airfilter outside cover and the air filter removed, take a look inside the carb throat to see (or not see) the gas squirt. I would bet on a bad / incorrect / poorly placed gasket that would cause the prime gas "circut to not work, maybe the bulb.
Click to expand...


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