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briggs and stratton popping


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#1 Matt O OFFLINE  

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Posted July 20, 2015 - 07:44 PM

Hi everyone, I have a Toro/wheel horse 12-32xl law tractor. It has a 12 hp, single cylinder Briggs and Stratton power built engine.

 The tractor starts right up, stays running and doesn't smoke at all but it pops when running. runs better with a little choke but with the setup with the throttle and choke I cant run it with the choke on because the choke is built in to the throttle adjustment. seems like its not getting enough fuel but I know it is because when I drop the bowl the gas pours in, checked the vent in the gas cap, change fuel line route and replaced fuel filter. I tried the sea foam trick down the carb twice and hasn't gotten any better. cleaned the carb twice(thought I missed something the first time) but nothing is working. when I restricted the air flow going into the carb I got a low idle but no high end power, remove the restriction and I get no idle and popping at any engine speed.

 

*the breather tube going into the air cleaner casting is broken and sucking in air from outside the air cleaner, could this cause the issue?

 

Thanks


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#2 stiemmy ONLINE  

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Posted July 20, 2015 - 08:02 PM

I'd personally look to make sure the high speed jet is perfectly clean as it sounds like a lean condition to me. Could also be a partially sheared flywheel key causing the timing to go wonky.

Good luck, and keep us updated! Cheers.
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#3 mtoney OFFLINE  

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Posted July 20, 2015 - 09:58 PM

Typical briggs needing valves adjusted and possibly a new carb.  Once these new briggs carbs go to crap, there isnt much you can do.  We have tried everything at our shop to save them. The OHV singles are also good for the valves going out of adjustment.  I would adjust the valves to spec and see how that does.  With needing a little choke, I would also be replacing the carb while it was in the bay.  Running hot and lean does the engine no favors for its life span.   Mike


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#4 JDBrian OFFLINE  

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Posted July 21, 2015 - 06:12 AM

Any chance you have an intermittent ignition problem? I would check the ignition circuit looking for bad connections, burnt, loose or shorting wires etc. I'm not sure what type of ignition that engine has but it may be worth giving it a checkup. It sounds to me like you have done everything possible in the fuel system. It might be a good idea to look elsewhere. I'd also make sure the crankcase venting is working properly. 


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#5 crittersf1 OFFLINE  

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Posted July 21, 2015 - 07:11 AM

Sounds LEAN to me.


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#6 Matt O OFFLINE  

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Posted July 21, 2015 - 07:19 AM

Thanks for the info! I will check the valves and electrical but before that, is there any chance the crack in the breather tube could cause this? Could it be sucking too much air?

Edited by Matt O, July 21, 2015 - 07:20 AM.


#7 crittersf1 OFFLINE  

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Posted July 21, 2015 - 07:58 AM

Anythings possible. Fix the obvious first.


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#8 stiemmy ONLINE  

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Posted July 21, 2015 - 07:59 AM

Yes it will suck air, but the inlet is in front of the carb inlet, so it won't affect anything other than drawing unfiltered dirty air.

Edited by stiemmy, July 21, 2015 - 11:10 AM.

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#9 stiemmy ONLINE  

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Posted July 21, 2015 - 01:08 PM

A goobered up float could cause a lean condition too.
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#10 Guest_Thesandmanisme_*

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Posted September 06, 2015 - 03:47 AM

One possibility is an intake leak. Carb gasket or card loose.

#11 holdenboy1960 OFFLINE  

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Posted September 06, 2015 - 06:19 AM

my understanding of fuel is , it runs rough , engine governs up & down, stalls or floods  

 

where popping i thought was always related to valves & or timing or spark

 

worn valve guides , burnt valves & or valve seats , valve lift settings wrong or timing not correct 


Edited by holdenboy1960, September 06, 2015 - 06:23 AM.





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