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Help with short winded 8N

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Paul

05-24-2000 21:46:48




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Hope someone can help me with the following situation. I’ve got a ’52 8N that I just got going last year after many years of sitting. I replaced all the ignition parts and took the carb apart & cleaned it up. I also cleaned the tank out as good as I could without taking it off. (I’m in the process of making a bracket to hold an alternator to convert it to 12 volt, though it starts up great now with the 6-volt). The problem I’m having seems to be a fuel delivery issue. Though it starts good with a healthy battery, (charging system is bad), you have to leave the choke more than halfway on to keep it running, and then it will only run for a short time. I’ve tried adjusting the needles to all combinations. The main needle did have a rust ring that pitted it slightly, but it didn’t seem to be bad enough to cause the problem. Does not have any of the exhaust past the manifold, so I imagine that’ll affect richness settings. The fuel bowl stays filled and doesn’t seem like much new rust is collected every time I check it. Last time I ran it with a new 12 volt, and it stopped starting before the battery was run down. It’s probably an obvious problem to somebody, but it has me stumped. Please help, as I’ve got a lot of work planned over the long weekend. Thanks

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TO2033322

05-25-2000 21:38:17




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 Re: Help with short winded 8N in reply to Paul, 05-24-2000 21:46:48  
Paul do you run the 8n on 12vdc now? If so then you should use a resistor for the coil. Running on 12vdc for extended periods will damage the coil.Recheck the coil If gas looks good but still will not start. Ihad 2 pennies now you have them.



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norm-wy

05-25-2000 14:29:56




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 Re: Help with short winded 8N in reply to Paul, 05-24-2000 21:46:48  
Paul
You said that your tractor starts great on 6V but you're going to convert over to 12V. My recommendation is "If it ain't broke, don't fix it!" Take a look at the Reply posted by BBStacker to Novice to 8N's below. There is a whole gob of truth in what he says. FWIW 8>) Norm-wy



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TimK

05-25-2000 07:18:03




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 Re: Help with short winded 8N in reply to Paul, 05-24-2000 21:46:48  
Get a carb rebuild kit at NH, and clean the sedment bowl and buy a new screen for it. Note: there is a filter screen on the carb inlet where the gas line is connected which could be clogged. I agree that running without exhaust will, or should, tend to lean it out. That coupled with a 50 year old carb that's probably sucking more air from places it shouldn't be, may be too much for the engine to handle regardless of fuel flow.

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Nolan

05-25-2000 03:45:59




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 Re: Help with short winded 8N in reply to Paul, 05-24-2000 21:46:48  
Sounds like a classic case of restricted fuel supply. The engine takes in more gas then is getting to the carburetor and goes lean. You choke it to compensate, eventually the float bowl gets so low the engine dies. Gasoline continues to trickle in from the fuel take, and by the time you get done examining other things the carburetor float bowl is once again filled up. The tractor then starts, and the cycle begins anew.

Work your way up from the carburetor to the tank itself examining for restrictions and blockage.

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JOHN

05-24-2000 22:12:11




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 Re: Help with short winded 8N in reply to Paul, 05-24-2000 21:46:48  
Greetings
No exhaust past the manifold? I would get the muffler and pipes on it before running it too much, there is a question about back pressure and that will affect the engine. Now as to the running, aside from that, did you clean out the screens and check the intake from the tank to the bowl? It may be that the fuel line is restricted due to junk in the line. Gas can solidify and leave a gummy deposit in the lines. You might consider a rebuild kit for the carb, that would solve any problems with the needle and seat. Good luck with it!
John :>)

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Tom A

05-25-2000 03:48:02




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 Re: Re: Help with short winded 8N in reply to JOHN, 05-24-2000 22:12:11  
Long winded answer to your short winded problem! I was in your situation about 18 months ago (except for wanting to convert to 12 v...bahhh.)

Anyway, Molly's problem turned out to be restricted fuel flow even though I was pretty-well convinced the flow was ok; the bowl never looked low, but apparently doesn't need to to affect running. The flow was just enough for the engine to start, run for a while and die. If I'd jump off the tractor just as it died and checked the carb float bowl, by the time I'd get there it would be full.

In desperation I emptied and cleaned fuel tank, blowing out and/or replacing all the filter screens (in-tank, sediment bowl, carb) and blowing out the fuel line itself. In my case, the culprit turned out to be a small round seed lodged in the pipe from the tank to the sediment bowl; once that blew out (hi-pressure air), she runs great and (knock wood) hasn't slowed down since.

So I'd suggest a thorough cleaning of entire fuel system.
good luck,
Tom & Molly (8N 118021)

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