LOL....
I have an older model Murray 36" riding lawnmower with a 12 HP Briggs "Power Built" vertical shaft in it.
So far I have replaced a new carb, spark plug, fuel filter and all lines. Simple fixes but no luck.
The rider operates fine when it is cold and first started up, and mows well. But once warmed up it goes to pot, runs intermittently going good for 15 or so seconds
then spurting and coughing and back firing for 5-10 seconds, then once again pulls and runs good for no more than a 15-20 second period, then once again spurting, coughing and back firing.
It keeps doing that unless you let it cool completely down, then recycles all the way through again, running good till warmed up and then spurting
and backfiring then running good and once more again farting through the carb.
I am hoping it is not anything internally broken, but since it is interment I am wondering if the problem is something else.
What is the timing system on this or can maybe the firing system/coil/armature electrical on this be going bad and thus backfiring then running good?
The consistent, without fail 15 seconds good, 5-10 seconds backfiring then back to good is what has got me wondering.
Seems to me if it were bad valves or something it would be continuously firing bad once warmed up.
Please keep this girl out of the scrap yard. Disabled 60 yr old here so I cannot afford to replace her.
thanks for the help in advance.
New member with sparse knowledge on this model rider and engine.
Drew
Also, while throwing advice in here, how do I set the adjustments on this single carb, only two adj. screws on here. See attachment please.
Thanks again.
I have an older model Murray 36" riding lawnmower with a 12 HP Briggs "Power Built" vertical shaft in it.
So far I have replaced a new carb, spark plug, fuel filter and all lines. Simple fixes but no luck.
The rider operates fine when it is cold and first started up, and mows well. But once warmed up it goes to pot, runs intermittently going good for 15 or so seconds
then spurting and coughing and back firing for 5-10 seconds, then once again pulls and runs good for no more than a 15-20 second period, then once again spurting, coughing and back firing.
It keeps doing that unless you let it cool completely down, then recycles all the way through again, running good till warmed up and then spurting
and backfiring then running good and once more again farting through the carb.
I am hoping it is not anything internally broken, but since it is interment I am wondering if the problem is something else.
What is the timing system on this or can maybe the firing system/coil/armature electrical on this be going bad and thus backfiring then running good?
The consistent, without fail 15 seconds good, 5-10 seconds backfiring then back to good is what has got me wondering.
Seems to me if it were bad valves or something it would be continuously firing bad once warmed up.
Please keep this girl out of the scrap yard. Disabled 60 yr old here so I cannot afford to replace her.
thanks for the help in advance.
New member with sparse knowledge on this model rider and engine.
Drew
Also, while throwing advice in here, how do I set the adjustments on this single carb, only two adj. screws on here. See attachment please.
Thanks again.