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ariens 20hp briggs popping when no load on motor

bhoff72's Avatar

Join Date: May 2013
Posts: 1

05-28-13, 10:39 PM   #1  
ariens 20hp briggs popping when no load on motor

Need help

I have a ariens 2048 zoom zero turn with a briggs 20hp v twin ohc motor. When the motor gets to operating temp it starts popping out muffler when no load on motor. If i engage deck it quits. It pops at low or high rpm. I have changed oil, filters, and plugs. I use super unleaded fuel. It runs and cuts grass but doesn't seem to have the power that it had. I haven't looked into it yet but thought maybe someone else had similar problem before i start. Thought maybe head gasket, valves, or bad coil?

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cheese's Avatar
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05-29-13, 12:28 AM   #2  
Pops like little pops and puffs, or bangs and backfires?

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Sharp Advice's Avatar
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05-29-13, 07:11 AM   #3  
Hello and Welcome bhoff72 to the Do-It-Yourself Web Site and the Small Engine forum.

Based upon all the conditions described, none of which are uncommon for a lean carb(s) fuel to air mix ratios. I.E. the carb(s) metering orifices have fuel flow restrictions. Both idle and high speed fuel jets need to be cleaned out. Meaning a total carb rebuilding. Engine requires both low speed and high speed jets supplying fuel during high speed or the condition described often results and is the cause.

Small engine repair parts, generic repair manuals and additional help are all available at all local small engine repair shops and or lawn mower repair shops in your area. Shops and dealers are listed in the phone book directory.

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butcho's Avatar

Join Date: Dec 2009
Posts: 170

05-30-13, 11:47 AM   #4  
Bad coil on one cylinder

Sounds to me like a bad coil or even a bad plug on one cylinder is not firing.Try taking off one of the plug wires from one or the other plugs and see if it makes a difference.

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