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Backfiring & popping when deck engaged


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#1 worknplay OFFLINE  

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Posted October 12, 2011 - 11:40 AM

Trying to get a MTD Gold Series lawn tractor to run properly. When the deck is engaged it backfires and pops but runs fine if the deck is not engaged. It's running a Briggs & Stratton. Have cleaned the carb and it ran great, even with a load, but next day the same problem occurred. I figure it has to do with the carb. Anyone have a similiar situation or any ideas what I could try.

#2 HDWildBill ONLINE  

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Posted October 12, 2011 - 05:03 PM

When you say clean the carb does that mean you took it apart and cleaned the jet's, passages? Are you sure you got all the varnish, dirt, corrosion out of there? Did you put a kit in the carb? If not you may need to.

#3 MH81 ONLINE  

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Posted October 12, 2011 - 06:02 PM

Sounds like mixture to me as well. Try opening the main jet 1/4 turn, see if that helps
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#4 worknplay OFFLINE  

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Posted October 13, 2011 - 08:00 AM

Yep, I took it apart and cleaned the jets. Haven't put a kit in but I may try that - doesn't have any noticeable signs that nozzles need replaced but maybe that will work. I've cleaned out the carb twice now so I'm hoping to come up with something else to try. Thanks for your reply!

#5 HDWildBill ONLINE  

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Posted October 13, 2011 - 11:00 AM

Perhaps this will help or this site at least it may give you some other avenues to follow.

Edited by MH81, October 20, 2011 - 07:27 PM.

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#6 worknplay OFFLINE  

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Posted October 14, 2011 - 08:50 AM

That is the greatest resource! :beerchug: Thanks!! That should give me a few different things to look at.

#7 smasher OFFLINE  

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Posted October 20, 2011 - 06:25 PM

Is it popping out the carb or the exhaust?

#8 worknplay OFFLINE  

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Posted October 21, 2011 - 07:47 AM

Took the carb apart and gave another good cleaning, then replaced the jets. Cut for 3 hours with no problems. Thanks to everyone for the ideas and great reference material for future repairs.

#9 dave8338 OFFLINE  

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Posted October 28, 2011 - 02:57 PM

A mis-fire under load is usually one of two things, or a combo of both.
1) A lean condition which you have addressed (have you checked the fuel filter)
2) Ignition ie. plug(s), coil, wire(s)




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