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8N Carburetor Help??

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Craig (WA)

09-07-2000 07:06:23




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Just got this 8N that sat for several years. I got it running and seemed on the way to success when it started running rough until it will only run with full choke for about a minute and die. I suspected dirt in the carb which I took apart and added a fuel filter. Made no difference. Do I need a carb kit? Where can I find one? Any help is appreciated.




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Dennis 8N (NY)

09-07-2000 13:12:54




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 Re: 8N Carburetor Help?? in reply to Craig (WA), 09-07-2000 07:06:23  
I had a very similar experience when I bought my 8N. I tried everyhing with the carburetor, including replacement. What I found was the problem with mine was that the gas tank had some kind of sediment that was fouling the sediment bowl and valve. I had to replace my gas tank to overcome this problem and returned the new carb.



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ZANE

09-07-2000 11:11:59




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 Re: 8N Carburetor Help?? in reply to Craig (WA), 09-07-2000 07:06:23  
It is obvious that the carburetor needs to be rebuilt or at least thuroughly cleaned and reassembled with new gaskets.
Remove the high speed and low speed needles and then take the four screws out of the bowl and seperate the two halves. Using a deep socket that will fit, take out the fuel nozzle from the venturi of the carburetor. Remove the small brass tapered plug from the bottom of the carburetor. Usiing a welding tip cleaner open up all the orifices in the carbutetor and then blow out with compressed air. After you are certain you have opened up every orifice, reassemble the carburetor with new gaskets. Set the small needle screw by turning it all the way in till it bottoms out and then turn it out one full turn. Install the large high speed needle and turn it till it bottoms out. Then turn it out one and one half turns. Check the relief valve on the choke butterfly to be sure the small spring is stil on it that holds it closed Till the engine is choked. It should be so it will open up when a vaccumm is built up as the engine is choked. If the relief spring is not on the flap the choke will not choke as much as it should.
Put it back on the tractor and it should be fixed

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Claus

09-07-2000 07:29:41




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 Re: 8N Carburetor Help?? in reply to Craig (WA), 09-07-2000 07:06:23  
Check the screen on the input of the carb to see if it is clogged. When it stoppes, immediately unscrew the bottom drain plug of the carg and see if you get fuel to drain. I suspect that you may have a leak in the intake manifold as it heats up. You can check this by spraying WD40 around the mating surface...
Happy Motoring
Claus



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Rick

09-07-2000 07:19:18




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 Re: 8N Carburetor Help?? in reply to Craig (WA), 09-07-2000 07:06:23  
It is hard saying what is wrong, first take the fuel line off to the carb, does it have a good flow of fuel to the carb? If not, clean out the fuel strainer. If it does, take the carb. off the tractor, check the filter in the "in" side of the carb. Then do a complete cleaning. Adjust the float and you should be in the ball park. Good luck. Also, to start out turn the needle valves out one full turn to 1 1/2 turns out from bottoming them out. Turn them in slow so you don't damage them. Also, check to make sure your breather is clear. Good luck. Lots of stuff in the archives on the carbs. I would clean it first before I got a new one.

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