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Tractor Talk Discussion Forum

Backfiring

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Jerry Barth

06-07-2007 22:26:17




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Guys, I've got an 8n, front mounted distributor. I've had it about ten years, it's always been easy starting. It didn't start about a month ago. I did a tune up, and replaced the rotor and cap. I also cleaned the carburator. Now it starts, but harder than before. It idles nice, but at about 3/4 throttle it backfires. I have a fuel filter, the flow seems normal. Any ideas? Could it be the advance springs on the distributor?
Thanks, Jerry Barth

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Walt Davies

06-08-2007 18:23:28




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
Actually this could be a lot of things. A bad coil, a bad condenser, Point bounce, a valve hanging up at high speed. A week valve spring. Bad gas. Water in gas. What you need to do is take each thing and check it out throughly till you find the problem. That is what a good Mechanic does don't guess just go though the entire system one thing at a time. Start with the easiest thing and work back to the hardest sooner or later you will find it and along the way you will learn a lot about how your engine works.
Walt

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Paul Janke

06-08-2007 15:58:21




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
I have seen that backfiring caused by a failing coil. When it fails completely the backfiring stops. So does the engine.



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old

06-08-2007 07:31:40




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
Backing firing can be caused by a couple things. #1 is that its running lean and that will cause the problem. You also say you have a filter, is that an in-line type filter if so take it out they cause more trouble then there worth. Plus on an 8N you have or should have 3 filters in the system any how. 1 in the tank, 1 in the sediment bowl and 1 in the elbow on the carb. In-line filters are made for systems with a fuel pump and take 7 plus PSI to work like they should and theres no way you will get that type of pressure from a ravity flow fuel system

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Walt Davies

06-08-2007 11:52:41




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 Re: Backfiring in reply to old, 06-08-2007 07:31:40  
That's funny cause all my lawn tractors have inline fuel filters does mean I should get rid of them to.
Walt



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RN

06-08-2007 12:37:38




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 Re: Backfiring in reply to Walt Davies, 06-08-2007 11:52:41  
Inline filters specified for Lawn and garden (and Motorcycle) gravity feed are usually more open filter material, less pressure needed for flow, keep using them. RN



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Steven@AZ

06-08-2007 06:59:26




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
Backfiring is generally a problem with ignition... usually timing. May be a worn part in the distributor, or the points cam.



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mjbrown

06-08-2007 06:08:54




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
I'm about the same age as your tractor and I backfire a lot more than I used to, about 3/4 throttle is the worst.;-)



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Jerry Coulter

06-08-2007 05:00:59




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 Re: Backfiring in reply to Jerry Barth, 06-07-2007 22:26:17  
Sounds like a worn out part in the distributor. Use a dwell meter and watch for steady dwell as you speed up the engine. At some speed, the points may either not close or not open and cause that problem.



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