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JD A running on 1 cyl when cold

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Brian

12-20-1999 08:39:28




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Help! my A (46) runs on one Cyl when cold, the drivers right side gets no fuel until way warmed up, and it takes along time. compression 80lbs both sides. Sprayed carb cleaner around intake -no difference! the low speed has to be turned out at least 3 turns to work at all. It used to work great. If there is only one carb and a single intake, how could one cyl get fuel and not the other?? Help!




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Pappy

12-20-1999 16:07:37




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 Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 08:39:28  
I believe you have a dirty or clogged carburetor.
The left cylinder inhales first and then 180 degrees later, the right cylinder inhales. If you are not getting enough fuel, the right cylinder starves. You probably need to clean the carburetor. Evaluate the situation, and understand the two intake strokes in 180 degrees and then nothing for 540 degrees. Think about it.
Pappy



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Paul

12-20-1999 10:40:40




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 Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 08:39:28  
I'm a "trial & error" mechanic. When I have a one cylinder miss, I always swap sparkplugs from one side to the other first. Many times the miss will swap sides too. I read all the posts about Champion plugs being bad, but I had already bought a box full of them before I learned. I'm a skinflint and refuse to throw them away. As soon as I use them up I'm going to try Autolite or AC plugs. I hope your problem is this simple.

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Jim

12-20-1999 10:26:45




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 Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 08:39:28  
Did you check to see if engine coolant is getting to the #1 cyl.



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mike

12-20-1999 09:32:26




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 Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 08:39:28  
I think the problem is proably carburation. If you rule that out I would take off elbow to cleaner from carb. Hold hand close to carb intake when miss is occurring. If you are getting backblow out of carb intake then you have an intake valve problem, be it a sticky valve, a weak valve spring or dirty valve seat, this last being the least likely as problem corrects itself.Sticky valves and or weak springs are a quick fix. If you determine this is your problem email me and I will try to help you through it. Remember, this free advice and 50cents will get ya a cup of coffe, but thats where I would sta rt looking. Mike

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Dan

12-20-1999 08:50:19




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 Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 08:39:28  
That is a good question. I have the same problem with my D. I think that there might be a problem with the valves. Or in my case the cam. You might clean the Carb , all passages first, and try the A. I hope the carb is the problem. It is easier to fix.



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Brian

12-20-1999 12:00:40




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 Re: Re: JD A running on 1 cyl when cold in reply to Dan, 12-20-1999 08:50:19  
Okay guys, I hope it is the carb, but why does the flywheel side get fuel and not the pulley side? There is only one intake port! And if it is a carb problem, how hard is it to clean? thanks!



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JDBob

12-20-1999 13:35:55




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 Re: Re: Re: JD A running on 1 cyl when cold in reply to Brian, 12-20-1999 12:00:40  
OK, here's my two cents worth on this. The first thing I would do is yank those plugs out and put in a set of AC. If that don't fix it. I'd almost bet the farm your looking at a valve prob.
I'd try cleaning the carb. first (Not a hard job) but I doubt that it's the prob.
If you want you can email me and I'd be glad to walk you through the carb. cleaning process. But it sure sounds like the valves to me, I've had the same problem in the past that you have now.
One last thought, have you check the valve settings?

JDBob

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