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No. 1 hits better than No. 2

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KEN C.

12-25-2002 17:50:37




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I'm still trying to get a good idle on a 36 A. Compression is the same, valve clearance is ok, gaskets are new,no leaks, but the right cylinder will not run as good as the left. Left side hits every time, but the right will hit a couple times, and miss some, and sometimes pop(loud). While adjusting on the carb i found i could screw the idle needle completely out of carb. and seem to run pretty good. Is there something wrong in the carb. Something i missed in cleaning. It's a dltx 8 brass carb. Thanks for any help, ken.

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Clooney

12-25-2002 18:04:31




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 Re: No. 1 hits better than No. 2 in reply to KEN C., 12-25-2002 17:50:37  
Ken, usually when you can completely remove the idle needle & have little effect, you either still have a problem in the idle circuit or you have other problems & have the throttle plate opened past the idle stage. Does closing the choke down to almost closed help the idle? If so, look for a restriction in the idle circuit or idle fuel feed passage. Is the throttle plate closed to almost shut at idle?
~Those old single barrel 2-cylinder Deere's don't hit real consistent on the R/H cylinder at idle, but shouldn't pop or idle erratic. ~Are you getting a good strong blue spark multiple times in a row on the R/H side? If not find out why.

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KEN C.

12-25-2002 21:02:01




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 Re: Re: No. 1 hits better than No. 2 in reply to Clooney, 12-25-2002 18:04:31  
Thanks Clooney for the help, i took the mag to a shop and had it rebuilt, but i will check to see if it's right. The bowl vent, I'm not sure about that,I'll take back apart and inspect. Sure wish we could get some of that snow you posted. We get a little about every three years. Thanks again, and i will let you know what i find. ken.



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Mark

12-26-2002 16:12:25




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 Re: Re: Re: No. 1 hits better than No. 2 in reply to KEN C., 12-25-2002 21:02:01  
Is the mag the original? Have seen many JD's with the wrong mag miss like your talking about. The mag is timed different for a JD since the crank is 180 degrees unlike most 2 cylinders.



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Earl

12-26-2002 17:47:35




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 Re: Re: Re: Re: No. 1 hits better than No. 2 in reply to Mark, 12-26-2002 16:12:25  
Mark/
Thats a new one that i havent heard of. Name one other 2 cyl engine that doesnt have a 180 crank that has a mag that will fit a 2 cyl deere A.



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Mark

12-28-2002 09:07:06




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 Re: Re: Re: Re: Re: No. 1 hits better than No. 2 in reply to Earl, 12-26-2002 17:47:35  
Earl:
Most 2 cylinder engines fire evenly (once every 360 degrees of crankshaft rotation). JD's fire both cylinders in the first 180 degrees of crankshaft rotation then the crank rotates 540 degrees (1 1/2 rotations) before the firing process begins again. This is how JD's get there distinctive sound. How does this affect a mag? Look at the cap of a 4 cylinder mag. Most 2 cylinder engines would use the terminals opposite one another (terminals 1 and 3), JD's use the terminals next to one another (terminals 1 and 2). If you have the wrong cap, cylinder 2 could be firing in the wrong place. Both caps could look alike since most 2 cylinder caps have the wires terminals coming out the side next to one another. The proper timing is molded into the cap. You would be surprised at the amount of JD's basically running on one cylinder. P.S. Yes, both of the above would have a crankshaft with the throws of the crankshaft 180 degrees apart.

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Earl

12-28-2002 09:41:34




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 Re: Re: Re: Re: Re: Re: No. 1 hits better than No. 2 in reply to Mark, 12-28-2002 09:07:06  
Mark/
Think about what you are saying. All 180 crankshaft engines fire at 180 deg. The only way a 2 cyl engine can fire at 360 deg is if both pistons come to tdc at the same time. Some motorcycles have a 360 deg crankshaft but very few larger engines have that layout. On a 180 deg crank engine the no 1 cylinder fires at tdc then rotates 360 deg or 1 complete revolution that will leave the no 2 at bdc and I doubt any engine would fire no 2 at botom dead center. You say "Most 2 cylinder engines fire evenly (once every 360 degrees of crankshaft rotation" then it shold be easy for you to name one tractor or large engine that does.

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Mark

12-28-2002 10:36:09




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 Re: Re: Re: Re: Re: Re: Re: No. 1 hits better than No. 2 in reply to Earl, 12-28-2002 09:41:34  
OK, OK,I did get it wrong. I should have written 1 and 4 on a four cylinder cap instead of 1 and 3. It depends on which side of the cylinder 1's cycle cylinder 2 fires on.



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