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  #1  
Old 08-31-2001, 10:27 PM
Robert Doubrava's Avatar
Robert Doubrava Robert Doubrava is offline
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Location: Beeville, Texas
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7 horse briggs backfires and pops at an idle

i was just wondering if this problem could be fixed somehow. i have the model, type, and code if it's useful to someone.

model-170702
type-151701
code-80032709


any help is appreciated.
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  #2  
Old 08-31-2001, 10:32 PM
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Robert Doubrava Robert Doubrava is offline
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i forgot to say, it is a vertical shaft engine. i believe it is an out of production engine, too.
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  #3  
Old 08-31-2001, 10:34 PM
khouse khouse is offline
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tell us more. does it pull fine otherwise? does it have good compression? does it backfire just above idle? ect.. this will help us help you.
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  #4  
Old 08-31-2001, 10:42 PM
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Robert Doubrava Robert Doubrava is offline
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it has good compression. its pretty hard to start, but it runs good if you have it at top speed. it is about 20 years old, but my dad and i overhauled it in about 1995-96.
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  #5  
Old 08-31-2001, 10:45 PM
khouse khouse is offline
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My guess is that your intake valve is not seating. Do you have a compression guage? What did you do to the valves and seats on the rebuild?
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  #6  
Old 08-31-2001, 10:46 PM
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Robert Doubrava Robert Doubrava is offline
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we bought new piston rings, a new rod, a gasket kit, i am not sure what else.
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  #7  
Old 08-31-2001, 10:49 PM
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Robert Doubrava Robert Doubrava is offline
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my dad has a compression gauge.when we over hauled it, we replaced the valve seats, and we made sure that they were still good.
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  #8  
Old 08-31-2001, 10:54 PM
khouse khouse is offline
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I would like to know the compression on your engine. First dry psi. Then give me the wet compression by adding a capfull of oil in the plug hole then retaking the test.
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  #9  
Old 08-31-2001, 10:57 PM
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Robert Doubrava Robert Doubrava is offline
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ok. when my dad is not working we'll try it.
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  #10  
Old 08-31-2001, 11:01 PM
khouse khouse is offline
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robert, just post back with your readings. good luck
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