Briggs & Stratton 550EX won't run now

[slicer89]

I was given a lawnmower to fix (Poulman pro) with the B & S 550EX motor with easy start, that would start and run fine, then die shortly after..... I figured dirty carb, no problem! Well, I took the carb apart and cleaned it thoroughly, didn't lose any parts, or mess up any seals.... Now the mower won't even start! I bought a new spark plug, and it's getting spark... but still not even trying to start.

I tried spraying carb cleaner down the carb to try to start it, still didn't work at all, and if I tip the mower over a little gas starts pouring out of the carb...

I checked the function of the float / needle, and it seems to work properly, it isn't sticking, or anything... and the rubber tip seems to be in good condition


any ideas? This mower is for someone who asked me to fix.

 

[shiftsuper175607]

I was given a lawnmower to fix (Poulman pro) with the B & S 550EX motor with easy start, that would start and run fine, then die shortly after..... I figured dirty carb, no problem! Well, I took the carb apart and cleaned it thoroughly, didn't lose any parts, or mess up any seals.... Now the mower won't even start! I bought a new spark plug, and it's getting spark... but still not even trying to start.

I tried spraying carb cleaner down the carb to try to start it, still didn't work at all, and if I tip the mower over a little gas starts pouring out of the carb...

I checked the function of the float / needle, and it seems to work properly, it isn't sticking, or anything... and the rubber tip seems to be in good condition


any ideas? This mower is for someone who asked me to fix.

Gasket missing? O-ring seal etc?
Linkages not connected?
Choke problem?
Try old spark plug.


It should TRY to start with starting fluid. You are spraying too much?

 

[mechanic mark]

http://www.poulanpro.com/ddoc/PPOO/PPOO2016_NAen/PPOO2016_NAen_push_115587727.pdf

troubleshooting section

post all numbers from engine data plate, model xxxxxx, type xxxx, trim xx & code number.

 

[slicer89]

Gasket missing? O-ring seal etc?
Linkages not connected?
Choke problem?
Try old spark plug.


It should TRY to start with starting fluid. You are spraying too much?

No seals missing and in good shape, seated properly.

Linkages connected and straight, move freely.

Not sure.

Okay... Will get back to you.

I didn't spray that much, barely a squirt.

 

[bertsmobile1]

Valve lash
blocked exhaust
stuck valve

 

[shiftsuper175607]

No seals missing and in good shape, seated properly.

Linkages connected and straight, move freely.

Not sure.

Okay... Will get back to you.

I didn't spray that much, barely a squirt.

choke open before spraying starting fluid....so it can get in the engine. Then close choke...try to start.

 

[slicer89]

choke open before spraying starting fluid....so it can get in the engine. Then close choke...try to start.

I did do that, it didn't seem to matter.

Like I said, It ran before I took the carb apart and cleaned it... It would just die shortly after.


And I can't get the valve cover off to see if the valve is stuck.... Just wouldn't make any sense because it ran shortly before.

 

[shiftsuper175607]

I did do that, it didn't seem to matter.

Like I said, It ran before I took the carb apart and cleaned it... It would just die shortly after.


And I can't get the valve cover off to see if the valve is stuck.... Just wouldn't make any sense because it ran shortly before.

Are you sure it is sparking?
I just worked on one....wouldn't start.
Put spark testor on it...no spark
tightened kill cable...it fired and start on first pull.


short story....must have fuel, air, spark

 

[pugaltitude]

This?

http://www.lawnmowerforum.com/showthread.php/37814-Briggs-amp-Stratton-engine

 

[shiftsuper175607]

This?

http://www.lawnmowerforum.com/showthread.php/37814-Briggs-amp-Stratton-engine

Question has been asked before...nothing goes there. (little white plastic nipple)


Again....Are you sure you have a spark inside the combustion chamber?