Back fire on b&s 250 cc polar force engine - Snowblower Forum : Snow Blower Forums
 
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post #1 of 6 Old 01-15-2017, 03:51 PM Thread Starter
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Back fire on b&s 250 cc polar force engine

Hi I have noticed on my Ariens deluxe 28 when the engine is warm and I go to shut the engine down and I slide the throttle control from fast to slow the engine has a subtle backfire, if I slide the throttle slowly there is no backfire. The engine runs good no choke when warm, checked valve adj ok. I don't think that this is normal. Does anyone have any ideas. thanks for your help.

2013 ARIENS DELUXE 28 921022 BRIGGS 11.50 Heated grips, 2 LED lights, armorskid plates, Impeller kit,Mini hour tach meter, Drift cutters, Tire chains
CRAFTSMAN 5HP 22IN TECUMSEH HS50-67195D
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post #2 of 6 Old 01-15-2017, 04:46 PM
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You should slowly lower the throttle all of the time. What you are seeing is normal with today's carb settings.
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post #3 of 6 Old 01-15-2017, 05:08 PM
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Nothing to worry about, I've had this happen on 4 of the B&S snow series engines I've worked on. Normal. It will even do it sometimes when reducing the throttle slowly, but not always.
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post #4 of 6 Old 01-15-2017, 05:38 PM
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thats normal, almost every engine does it
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post #5 of 6 Old 01-15-2017, 11:13 PM Thread Starter
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thanks i'm still learning about small engines

2013 ARIENS DELUXE 28 921022 BRIGGS 11.50 Heated grips, 2 LED lights, armorskid plates, Impeller kit,Mini hour tach meter, Drift cutters, Tire chains
CRAFTSMAN 5HP 22IN TECUMSEH HS50-67195D
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post #6 of 6 Old 01-16-2017, 08:51 AM
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Cool

IMO this could be from carbon deposits. Run some Sea Foam through it and see if it helps. Can't hurt and will clean the fuel system also.


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