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C starting

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Texas Denny

09-16-2007 18:00:47




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A friend has a C with a rebuilt engine. It runs great but if he turns it off (or kills the engine) after it's been working an hour, it won't start unless it sits for 10 or 15 minutes. I don't think points, condenser or coil have been changed for quite a while. I adjusted his valves last week - they were a bit loose but none were tight. Is the condenser and/or coil the likely problem. Or?




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bundy

09-21-2007 21:01:07




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 Re: C starting in reply to Texas Denny, 09-16-2007 18:00:47  
on my c i have to drain the carb then it will start. it is a vapor lock on mine. i drain the carb then she will fire on 3 cranks.i tried to pull start but no go untill drained the carb.



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El Toro

09-17-2007 04:00:09




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 Re: C starting in reply to Texas Denny, 09-16-2007 18:00:47  
The condenser or coil can cause that. Pull off a plug wire asap when it quits and check for fire.
Hal



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John T

09-16-2007 19:52:53




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 Re: C starting in reply to Texas Denny, 09-16-2007 18:00:47  
Denny, On those heat/time related ignition failures I always try the condensor first since its so cheap n easy to replace and clean or replace the points if needed of course. If the coil isnt running overheated (so hot cant lay hand on it) or leaking any nasty fluid and dont smell like burned electronics its often okay but if all esle fails then I suspect it last.

You really need to pull a wire n she if shes firing immediatley after she shuts down like old n others mentioned. Carboned up loose switch contacts or ballast resistors etc can be other heat/time ignition failure suspects.

I didnt think you have vapor lock problems on gravity fuel systems????? ?? Thats more for fuel pumps when air bubbles form in the suction side and she cant suck fuel right???

John T

The lil D 15 is still doin great. I did have to put a clutch in it last winter but all else is still good.

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Texas Denny

09-16-2007 20:35:08




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 Re: C starting in reply to John T, 09-16-2007 19:52:53  
Didn't you have a problem with third gear? Maybe my memory is getting mixed up.



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John T

09-17-2007 05:36:22




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 Re: C starting in reply to Texas Denny, 09-16-2007 20:35:08  
Yep it still jumps out of third gear like my AC buddys said many do grrrrr rrrrr rrr and you gave me some tips but since Im selling my cows today n about quit farming Ive found an easier way to fix it I DONT USE THIRD GEAR LOL

John T



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old

09-17-2007 07:13:07




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 Re: C starting in reply to John T, 09-17-2007 05:36:22  
John, you know I have 2 of those trannys laying around on parts C if you need some parts to fix that one you have



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Texas Denny

09-17-2007 08:00:07




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 Re: C starting in reply to old, 09-17-2007 07:13:07  
His tractor is a D-15. Thanks,



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steve(ill)

09-16-2007 18:43:36




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 Re: C starting in reply to Texas Denny, 09-16-2007 18:00:47  
if it was an electric problem, i think it would shut down on its own when hot. i would guess possibly a gas problem, with vapor lock?? (gas evaporates), let it set and it refills the bowl after the cools off a few minutes.



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Texas Denny

09-16-2007 19:18:18




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 Re: C starting in reply to steve(ill), 09-16-2007 18:43:36  
If that is the problem, is there a way to avoid it?

If it was running fine when the magneto (just remembered it had a magneto rather than a distributor) was shorted, how could it vapor lock for restarting? I thought vapor lock stopped a running engine.



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Dick L

09-16-2007 19:26:42




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 Re: C starting in reply to Texas Denny, 09-16-2007 19:18:18  
When it does not want to start take a plug wire off and check what the spark looks like while cranking.



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old

09-16-2007 19:24:52




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 Re: C starting in reply to Texas Denny, 09-16-2007 19:18:18  
Is it a crank start or does it have a starter. If hand start thats a common problem for some reason. With it haveing a mag it could be a few other things also



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Texas Denny

09-16-2007 20:30:58




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 Re: C starting in reply to old, 09-16-2007 19:24:52  
Electric start, 12 volt.



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John T

09-17-2007 05:38:46




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 Re: C starting in reply to Texas Denny, 09-16-2007 20:30:58  
If 12 volt was it converetd from 6 and if so is there an external voltage dropping (12 to 6) ballast resistor or a full 12 volt coil??? If NOT the coil will overheat n run so hot you cant lay your hand on it.

John T



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Texas Denny

09-17-2007 08:03:01




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 Re: C starting in reply to John T, 09-17-2007 05:38:46  
I forgot when I started post. The tractor has a magneto so has no coil or need for a ballast resistor. There is a possibility that the magneto is getting weak; it is 62 years old - even older than me!



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