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8N Carb Problem

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Seth Bardash

08-28-2001 08:38:03




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Just rebuilt the carb on an 8N (front distrib) for a friend. After the rebuild, (carb was in really bad shape) the idle mixture screw peaks the idle only when fully closed. Main mixture screw acts properly and can be adjusted properly.

Any ideas or help would be appreciated.




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chuck

08-28-2001 11:18:02




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 Re: 8N Carb Problem in reply to Seth Bardash, 08-28-2001 08:38:03  
Seth, I have been around and around on this. My 51 engine was rebuilt in 1992. Had the same problem with the idle screw before and after the rebuild. So I bought a brand spanking new carb-same problem. I then bought a brand spanking new manifold and gasket-same situation. I have sprayed enough WD-40 on the whole mess to float it with no change. I resigned myself to just leaving it closed and it runs fine. It's against my nature to not be able to adjust it but that's where it is. Every so often I open it up a little to see if anything has changed-nothing ever has so it goes back closed. The tractor runs fine but I may try Joe's approach just to sooth my nerves.

chuck
436244

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9Njoe

08-28-2001 08:47:57




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 Re: 8N Carb Problem in reply to Seth Bardash, 08-28-2001 08:38:03  
Seth,

I had the exact same problem on my 9N after a rebuild. All I know about it is that when the idle mixture screw is fully seated, that is full rich. So, what we both have is a lean idle mixture. I was never able to fix mine so I drilled out the idle jet a few sizes bigger and now I have some adjustment range on it. I never did figure out just why my idle mix got so lean. I checked the obvious stuff like the carb gasket, the manifold, the shafts in the carb to be sure that air was not getting past those. Never did find it but cured it with a drill. I am doing a complete valve train rebuild maybe it has something to do with the valves, we shall see. If anyone else has this problem maybe we will both get the answer.

Good luck,

Joe

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Dell (WA)

08-28-2001 08:45:09




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 Re: 8N Carb Problem in reply to Seth Bardash, 08-28-2001 08:38:03  
Seth..... ..sounds like you got an air leak somewhere. You did replace the felt washer around the throttle shaft didn't you? Try spraying WD-40 around any and all potential air leaks. The oil will temporarily seal any leaks and change the engine running characteristics. Some worry that the WD-40 propellant can catch fire, but I don't worry..... ..Dell



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