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John Deere Tractors Discussion Forum
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confused

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BUDD

08-03-2006 06:48:35




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Ok here is one for ya 53 "G" .125 over stock stroke with flat head and big nut carb. It was running backwards when shutting down so I put new cap and rotor and plugs. Went to the pull ran fine on first hook. Shut it down (it back fired) and later tried to start and it would not start. Did the following, checked gas at carb (got good flow at drain at bottom of carb) replaced plugs again installed the old cap and rotor replaced coil with one off another tractor (good one) pulled it and pulled it some more (batt was fine just did not want to crank on it) pulled the left plug out again (getting gas plug is wet) check for spark. It had spark, but seemed alittle weak. Then the darnest thing happened it started and ran on the right side only (plug on left side was out), but it would not rev up at all, it just ran at ideal. After about 1/2 hour working on this "G" finaly gave up and was pulling it around to get inline with trailer to load. Tried one more time to see if it will start and the thing popped right off and ran good. This makes no sence to me. What am I missing here
BUDD

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johns48b

08-04-2006 16:18:53




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 Re: confused in reply to BUDD, 08-03-2006 06:48:35  
if it cranks good cold and quits or want crank when its hot replace you coil.



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Duane Larson

08-03-2006 07:26:28




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 Re: confused in reply to BUDD, 08-03-2006 06:48:35  
BUDD,
Normally running backwards has to do with timing - have you checked your timing and if so, how many degrees before top dead center are you running?

I would also check the battery voltage 1) after it has been sitting overnight, 2) during cranking, and 3) if this happens again, during cranking. A good battery will measure about 12.6V after sitting, and should not drop more than a couple of volts during starting. If you are running a 12V coil, and your battery is weak, the voltage drop to the starter may be too great to provide a good, hot starting spark. Also, you need a BIG cable from the battery to your starter - like 00 to minimize voltage drop, as well as a very good battery ground.

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F-I-T

08-03-2006 07:11:59




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 Re: confused in reply to BUDD, 08-03-2006 06:48:35  
Even with the gas on the plug, is there a chance your left side intake valve was hanging open just a tad? This could cause some backfire to enter the manifold which and consume the fuel mixture intended for #2. Then when you took out the #1 plug, you removed the possibility of the backfire so #2 hit and ran (which they will do). Later after pulling it around, the valve released and normal firing resumed. If it happens again, check the compression on #1 right away.

Just guessing here.

Frank

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TimS

08-03-2006 08:55:25




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 Re: confused in reply to F-I-T, 08-03-2006 07:11:59  
Sounds like timing with it running backwards before, now with weak spark it sounds like something else in the ignition system is weak or failing...is this still points/condenser/coil system or electronic? Try and check each piece individually, replace the condenser if you haven't ( if it has one I mean ).



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