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  #21  
Old 09-11-2014, 04:45 PM
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FrankF3 FrankF3 is offline
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Why does everyone keep saying lean....... you don't get exhaust backfires on a lean running motor.
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  #22  
Old 09-11-2014, 04:46 PM
c69ss396 c69ss396 is offline
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Why does everyone keep saying lean....... you don't get exhaust backfires on a lean running motor.

exactly a backfire is caused by excessive fuel. Running lean is caused by lack of fuel... therefore no fuel no back fire....
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  #23  
Old 09-11-2014, 06:18 PM
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Well I can't order parts from the onan site for a few more days. So until then, the tractor will wait.
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  #24  
Old 09-11-2014, 06:23 PM
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What about doing a leak down test. Could unburned fuel be going in the exhaust causing it? Just throwing that out there. Onans are known for valve seat issues also.
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Old 09-11-2014, 06:36 PM
J-Mech J-Mech is offline
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What about doing a leak down test. Could unburned fuel be going in the exhaust causing it? Just throwing that out there. Onans are known for valve seat issues also.
An exhaust backfire is basically unburned fuel. So, your right about that. A leak down test is not a bad idea. But I think it's a carb issue. Brent said the PO told him it started all at once, so unless a seat came out, I'm not sure it's just wear. Although, PO's do tend to exaggerate, and not always tell the whole truth. I don't think I'd go to the trouble of a leak down test until after going through the fuel system and doing a tune up. Just my

Not a bad idea by any means Todd!
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Old 09-12-2014, 12:23 AM
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I agree J, I was just throwing that out there. That's what I would also do first (clean the carb). IIRC the one I did I was able to reuse the carb gaskets.
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