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Stalling Briggs & Stratton B&S 158cc

#1

W

wtc101

Re: Stalling Briggs & Stratton B&S 158 cc stalls (eng # 10T502 0457 B1 09072054)

Two weeks ago I replaced the diaphragm and gasket (leaking fuel). Otherwise the engine ran strong. Following the replacement the engine now stalsl with in 2 seconds. Must keep priming. Notice the air vane and governor moving back and forth until stall. If I hold the air vane 'open" the engine will run. Today, I installed a new carburetor #795477 but no change. Can anyone tell me if I might have screwed up the governor spring or air vane?? HELP PLEASE


#2

M

mechanic mark

Read your operators manual especially pages 8 & 9 regarding engine, adjust valves: Engine Cold per specs.


#3

pugaltitude

pugaltitude

Simple things 1st.
You said it ran strong before you did the carb.
Did you fit the diaphragm and gasket the correct way?
Diaphragm on tank then gasket next to carb.
If its wrong it does give symptoms you are getting.


#4

B

bertsmobile1

Also check that long induction tube they get somewhat brittle and seem to crack at the slighest provocation.


#5

PUSH

PUSH

I have nearly the same model and was having similar trouble.

http://www.lawnmowerforum.com/briggs-stratton-forum/35996-craftsman-550-simple-carb-fix-thanks.html

after changing the diaphragm, cleaning the air filter , cleaning the carb , gas tank + all the screens on the carb - changing the spark plug

I found I had the throttle was stuck in the wrong position. it was a simple fix I overlooked.

PUsh


#6

W

wtc101

mechanic mark said:
Read your operators manual especially pages 8 & 9 regarding engine, adjust valves: Engine Cold per specs.
Click to expand...


Thanks, will review


#7

W

wtc101

pugaltitude said:
Simple things 1st.
You said it ran strong before you did the carb.
Did you fit the diaphragm and gasket the correct way?
Diaphragm on tank then gasket next to carb.
If its wrong it does give symptoms you are getting.
Click to expand...

All was installed correctly...thank you


#8

W

wtc101

bertsmobile1 said:
Also check that long induction tube they get somewhat brittle and seem to crack at the slighest provocation.
Click to expand...


Both the new and old tubes appeared in good condition...thanks


#9

W

wtc101

PUSH said:
I have nearly the same model and was having similar trouble.

http://www.lawnmowerforum.com/briggs-stratton-forum/35996-craftsman-550-simple-carb-fix-thanks.html

after changing the diaphragm, cleaning the air filter , cleaning the carb , gas tank + all the screens on the carb - changing the spark plug

I found I had the throttle was stuck in the wrong position. it was a simple fix I overlooked.

PUsh
Click to expand...

Can you explain what you mean when you say the throttle was in the wrong position? Keep in mind I replaced the carb. So I am wondering if I screwed up the governor or air vane (throttle)??


#10

PUSH

PUSH

wtc101 said:
Can you explain what you mean when you say the throttle was in the wrong position? Keep in mind I replaced the carb. So I am wondering if I screwed up the governor or air vane (throttle)??
Click to expand...

oh sorry man - I wasnt aware you responded until now.

pictures might be better to explain:

throttle incorrect postion:
see how the boom a rang shaped throttle has slipped past the governor block.. it's past the block to the right.. it has to be behind that stop block to work properly:
throttle incorrect position.JPG

now here it is in the correct position behind the block:
throttle correct position.jpg

I also removed my carb and when i put it back together is when I finally noticed this after looking at some other pictures of the carb installed online.
hope this helps.. it's all that was wrong with mine.
PUsh


#11

W

wtc101

PUSH said:
oh sorry man - I wasnt aware you responded until now.

pictures might be better to explain:

throttle incorrect postion:
see how the boom a rang shaped throttle has slipped past the governor block.. it's past the block to the right.. it has to be behind that stop block to work properly:
View attachment 28205

now here it is in the correct position behind the block:
View attachment 28206

I also removed my carb and when i put it back together is when I finally noticed this after looking at some other pictures of the carb installed online.
hope this helps.. it's all that was wrong with mine.
PUsh
Click to expand...

Again, I appreciate the conversation and the pictures. All is correct in my linkage and install. I called my local repair tech and he thinks the intake tube may have cracked or separated at its mount allowing some air leak. I am going to look this over as soon as this weather warms back up. Thanks again.


#12

PUSH

PUSH

wtc101 said:
Again, I appreciate the conversation and the pictures. All is correct in my linkage and install. I called my local repair tech and he thinks the intake tube may have cracked or separated at its mount allowing some air leak. I am going to look this over as soon as this weather warms back up. Thanks again.
Click to expand...

No problem - sorry it wasn't just a simpler fix
Good luck with the tube replacement

PUsh


#13

B

bertsmobile1

The 4th post suggested just that,
People who are unfamiliar with the engine put too much stress on the tube when removing & reinstalling the carb.
It is way too long to only be supported only at one end.
Replace the gasket if you remove the tube because the old one will be hard and thus difficult to reseal.
Use a nut diver in your hand to do the nuts up with as they are very small and easily stripped.


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