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No more choke required while running

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'52 8N (MD)

06-27-2003 05:09:17




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Thanks to all here the fuel system case (and extra air intake) is officially closed. The engine only ran smoothly before with the choke opened about 1/3. In rebuilding the carburetor I noticed air was slipping by the manifold/carb gasket and one of the carb/cleaner connections. It didn't hurt to completely clean out all the passages in the carb and change out all three jets. The archives and helpful posts made all the difference. wc

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Rodney

06-27-2003 09:17:47




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 Re: No more choke required while running in reply to '52 8N (MD), 06-27-2003 05:09:17  
Sounds like you may have hit on exactly the same problem that I have. A recent engine rebuild also included a carbeaurator rebuild. Initially it all worked just fine, but now I have to run with the choke wide open to run at all. If I let the choke in at all it either runs really bad or dies.

Could you summarize your problem for me and let me know what you did to fix it. I can't seem to find any obvious air leaks, but that sure seem to be the problem.

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'52 8N (MD)

06-27-2003 13:17:34




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 Re: Re: No more choke required while running in reply to Rodney, 06-27-2003 09:17:47  
Rodney - I know you've searched the archives at least, I saw your post. Seems to me that you have a big time air leak or a gas starvation/vacuum problem. I would start by take carb cleaner or WD40 and spraying it around the intake manifold (cold engine, just started), the throttle shaft (side closest to engine) and the manifold/carb gasket. Also, if you aren't getting enough gas this can also cause the same problem. If your gas cap isn't venting, it won't let in the air in to let the gas out. Are you turning on the gas petcock 4 full turns? Have you checked the 90 degree carb inlet fuel strainer and watched the gas pour into a can with the petcock opened? Have you checked all three screens in the fuel inlet system?
If there is a chance that debris got into the carb after you rebuilt it, a clogged jet or passageway could also be the cause of your problem. A weak coil or reduced spark capability can also require a richer mixture so be sure to backtrack to any other repairs or changes you have already made. wc

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Rodney

06-27-2003 13:30:25




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 Re: Re: Re: No more choke required while running in reply to '52 8N (MD), 06-27-2003 13:17:34  
Thanks for the reply. What indication of air leak do you see with the WD40 spray? I have checked the filter in the 90 degree connection, but am not familiar with the other two filters that you referred to. Where are they?

I have checked the spark, seems plenty strong at all four plugs. My problem started with some suspect gas (dirty) and got worse after I disassembled the carb.

Thanks very much for you help.

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'52 8N (MD)

06-28-2003 04:43:03




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 Re: Re: Re: Re: No more choke required while runni in reply to Rodney, 06-27-2003 13:30:25  
Rodney - The WD40 or carb cleaner are both a volatile organic compound or VOC. This just means they both burn. If you have a leak on the intake and you spray it into the leak your engine will start to run faster since it is getting extra fuel. The other two filters are in the gas tank and sediment bowl/petcock assy.
I know it's a pain, but you might just want to break down and remove the hood and gas tank and refurbish and coat the thing on the inside with Breem or some other product.
Let me finish with a short story. After rebuilding my carb with a New Holland kit everything ran fine. I discovered an old extra carb on the shelf in the barn so, since I still had some extra parts left over, I decided to rebuild it as well. The 90 degree fuel inlet strainer in the old carb looked so much better than the one I had in the tractor, I decided to swap it. When I went to hook up the new one to the fuel line I had a little trouble so I had to bend the fuel line a little to get it to thread properly. As a result of bending the line, some junk got loose on the inside and got in between my float needle and seat in my carb. When I went to start the tractor it not only would not start but gas came immediately spilling forth out of it's belly. The moral is just that little bit of bending the fuel and swapping out the strainer got me into a jam. This is why I suspect that you need to go back into the carb. wc

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Almost forgot...

06-27-2003 07:52:45




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 Re: No more choke required while running in reply to '52 8N (MD), 06-27-2003 05:09:17  
I used the New Holland rebuild kit which had the throttle shaft and choke shaft seals. I am pretty sure air was getting into the carb through the throttle shaft as well. That makes three different places where air was slipping in. The posts that advise VOC's be sprayed around the intake manifold (to see if air is getting in) should be expanded to the manifold/carb gasket and the throttle shaft as well.

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Rob

06-27-2003 08:02:55




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 Re: Re: No more choke required while running in reply to Almost forgot..., 06-27-2003 07:52:45  
The leak in the air intake was upstream of the choke and wasn't a factor. That's the good news, the bad news is that leak let unfiltered air into the engine and that is a problem.



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Gary_N_WV

06-27-2003 05:26:01




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 Re: No more choke required while running in reply to '52 8N (MD), 06-27-2003 05:09:17  
Thanks for posting "the cure".
We see so many questions here, but seldom see what actually fixed the problem.



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