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Garden Tractors Discussion Forum

how do you cure a backfire

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jnewark

04-14-2005 06:38:51




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got a friend who has a 17.5 hp briggs riding mower, when he shuts it off he has an exceptionally loud backfire (about 5 seconds after shutting it off) I told him to iddle her down for a min. or so, that cured it, howerver he is still in a hurry, doesn't wait scares the heck out of his neighbors... anything else he can do? thanks
jack




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jd b puller

04-15-2005 19:10:30




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 Re: how do you cure a backfire in reply to jnewark, 04-14-2005 06:38:51  
The best way to shut them off is wide open. This shuts off the fuel to the carb. Don't let someone tell you it will hurt the engine. Everything is the same as when it is running except that there is no fuel going to it.

Trust me on this one.



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mcanders

04-15-2005 13:41:49




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 Re: how do you cure a backfire in reply to jnewark, 04-14-2005 06:38:51  
I always richened the idle mixture up an 1/8 turn on the adjusment screw and run and repeat until backfire is gone. If I cannot get good a good idle to main transistion, I will split the difference and let it idle a minute longer before shutting off.



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Kent of SW MO

04-15-2005 07:27:43




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 Re: how do you cure a backfire in reply to jnewark, 04-14-2005 06:38:51  
If you do not idle down and WAIT the engine as it coasts down pumps an air/fuel mixture into the HOT muffler. The heat of the muffler causes this to cook off and go BANG.

Kent



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jed1950

04-14-2005 16:33:55




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 Re: how do you cure a backfire in reply to jnewark, 04-14-2005 06:38:51  
the idle stop may be set too low,this will cause the speed to drop past the idle speed



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Bob

04-14-2005 08:33:40




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 Re: how do you cure a backfire in reply to jnewark, 04-14-2005 06:38:51  
If it is a newer unit it will have an electrically operated fuel shutoff (solenoid) in the main jet.

If that were to stick open, backfire would result.

Otherwise, about all you can do is to let the engine idle to cool down, and make sure to have the throttle closed when the ignition is shut off.



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Larry in IN Number2

04-18-2005 12:56:55




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 Re: how do you cure a backfire in reply to Bob, 04-14-2005 08:33:40  
I"m gonna side with Bob here. I had a Brand new mower that the solenoid on the carb was bad. and BANG!. That was fun in the small mower shed!

The solenoid needs 12v to OPEN and let the Mower run. I have seen them wired to always have 12v, then it runs the battery down.



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