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8N Not Quite Right

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Patrick (Sussex

09-08-2002 13:44:20




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Thanks to all for help on my "new" 1950 8N side mount. I have gone through just about every system and I am content (cosmetic restoration to come)except for the engine. The tractor starts and runs great, but under load needs a bit of choke to develop full power/run smoothly. I first thought it was a governor problem, but don't understand why, with a little choke, the governor seems to function properly.

I just replaced the manifold gaskets on the theory that it was "sucking" air. Didn't make any difference. All of the fuel system has been cleaned and gas is flowing freely to the carb. The carb looks pretty clean (I had it off to replace the manifold gaskets), but I haven't disassembled it. I checked the gaps on the spark plugs, but haven't replaced them (they looked new when I bought the tractor. The points look new as well. The tractor does occasionally "pop" through the exhaust when it is coasting.

Any help is most appreciated.

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Patrick (Sussex, NJ)

09-09-2002 04:53:28




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 Re: 8N Not Quite Right in reply to Patrick (Sussex, NJ), 09-08-2002 13:44:20  
Thanks guys. I will try and enrichen the mixture a bit, and if that doesn't work, look to clean/rebuild the carb.



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ZANE

09-09-2002 04:11:18




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 Re: 8N Not Quite Right in reply to Patrick (Sussex, NJ), 09-08-2002 13:44:20  
Cleaning the N carburator.
If it is as cold as you say the problem may well be the presence of moisture in one or more places in the fuel system. Water likes to go to the bottom of gasoline and the bottom of the system is at the bottom of the carburetor.You will never get it to run until you get the carburator warm enough to melt the ice and get it out some way. The best thing to do is to take the carburator off and take it inside the shop and warm it up and then take it apart. Remove the big high speed jet needle from the front of the carb. It will be facing down and angled to the back slightly.
Be very cautious about the gas in a closed area and have no source of ignition so you don't set yourself of fire with the gas. The bottom of the bowl needs to be cleaned good and then blown out with compressed air. If you have the right tool to do it you need to remove the high speed fuel nozzle. That is the brass thing in the venturi (throat) of the intake that is pointing down and toward the front. It takes a long socket of the right size and don't try to get it out with a pair of pliers or you may get it so it can never be removed and cleaned. There will be several little holes in the jet that come into the bore from the sides and they all need to be opened with a needle of the right size. The best thing to use is a welders tip cleaner as it will have an assortment of different sizes and one will fit. Always use the biggest one you can get to go into the hole,

Be absolutely sure that the orifice in the bottom of the carburetor just below the point that the high speed needles sits when assembled is absolutely clean and free of all foreign material.

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Al

09-08-2002 20:04:38




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 Re: 8N Not Quite Right in reply to Patrick (Sussex, NJ), 09-08-2002 13:44:20  
Pat,seems your running too lean,try opening your main jet an 1/8 of a turn until you can run under full load without chocking.



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Dan in Alabama

09-08-2002 14:28:59




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 Re: 8N Not Quite Right in reply to Patrick (Sussex, NJ), 09-08-2002 13:44:20  
For my part I say do a carb rebuild and make sure you use a fine wire to clean every hole in the sucker. I had a similar problem and after the first carb rebuild didn't fix it, I tried everything else until I came back to the carb. Did the rebuild kit myself the second time and she runs like a wild horse. If this fixes the problem please let me know. You will be number three (that I know of) that using choke for good performance meant carb problem.

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Rusty 2N

09-08-2002 13:48:19




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 Re: 8N Not Quite Right in reply to Patrick (Sussex, NJ), 09-08-2002 13:44:20  
Valve adj. maybe? Did you do a compression test?



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Patrick (Sussex, NJ)

09-08-2002 13:55:17




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 Re: Re: 8N Not Quite Right in reply to Rusty 2N, 09-08-2002 13:48:19  
I haven't done a compression test. Oil pressure is great (50+ start, settling to around 40lbs at full power warm). The exhaust is also pretty clean. The manifold wasn't oily to speak of..

Thanks.



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