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8n running good cold-missing hot (still no cure)

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ricky

11-19-2002 16:41:09




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o.k. over the last two days this is what i tried. two new coils. one new condensor. new plugs. new carberator. new ignition switch. i changed these one at a time and try it so i would know what was causing it. (still no cure) this afternoon i bought a voltage regulator and new plug wires. the voltage regulator was the wrong size it was to big so i returned it and bought the old one with me. he didn't have any. so i returned home and changed the plug wires and put the old voltage regulator on. now i have no fire at all. (questions) could this voltage regulator be my problem ? what function does it have if any in firing? (for any new comers its a 8n 1949 6 volt with frount mount distributator)
it is getting fustrating
thanks in advance for any advice.....
ricky

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Fast Ed Ohio

11-23-2002 23:31:54




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
Words of thought, that battery is positive to ground , the plug wires are on properly ( 1243 ) The pig tale spring on the bottom of the coil is touching, points stuck or not arching, flat spring from points to coil is broken ???



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Scott(TN)

11-20-2002 06:33:45




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
You may have looked at this already, but I didn't see it mentioned in your post. Be sure to clean the screen in the gas tank. Had this happen to me and I missed that part.
One other suggestion; run it until it starts to miss then pull the plug wires one at a time to locate the cylinder(s) that are not firing. Shut off the tractor and pull that plug, then attach plug wire back on, ground the plug, crank and see if you get spark through the plug. What type of plugs are you using?

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Bob Jarvis

11-20-2002 04:48:16




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
I recently had a similar problem - turned out that something in the carburetor was clogged up, and rebuilding the carb seems to have cured my problems getting it to run when warmed up. You might try blowing out the carb passages with air to see if that has any effect. A question - when you start it cold, do you find that you have to hold the choke out to keep it running? If so, that may indicate an air leak somewhere in the intake tract. When it's warmed up and starts to have problems take some WD40 and spray it around the throttle shaft where it enters the carburetor, around the carburetor gasket, around the gasket where the carb attaches to the intake manifold, around the gasket where the manifold attaches to the block, and all around the block where the head bolts on. If the engine smooths out for a bit when you spray oil at a certain place you've found your air leak.

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Where are you located?

11-19-2002 19:44:13




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
Where are you located?



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ricky

11-19-2002 23:13:30




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 Re: Re: 8n running good cold-missing hot (still no cure) in reply to Where are you located?, 11-19-2002 19:44:13  
south louisiana



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BOB

11-19-2002 19:06:47




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
1-points like Dell says
2-this may sound dumb but how much gas is in tank when this happens. REMEMBER these old babys are gravity feed. 3-filter in carb fitting CLEANED?
4-how far are you opening fuel bowl? two position on them
5-RUNS good cold. after gas has chance to refuel carb and such when sitting
6-MISSING when hot.gas gets all used up then runs poorly maybe starvin for gas trying to help BOB

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ricky

11-19-2002 23:18:45




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 Re: Re: 8n running good cold-missing hot (still no cure) in reply to BOB, 11-19-2002 19:06:47  
gas tank is full.filter in carb and above gas bowl bowl both clean. all the way open. it has to sit for at least about an hour for it to run good again. thanks for the help.
ricky



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Dell (WA)

11-19-2002 18:45:58




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
Ricky..... .....ya really gonnna haffta bite the bullet on this one and gettcha a real voltmeter ($20 cheap) and start measuring volts and find out where they stop. And what the voltage values are at each step of the way.

There really is no cause/effect relationship between your voltage regulator and your not running at all. The only real relationship it the person turning the screwdriver, did he replace the wires correctly?

I flunked mindreading, just ask my ex-wife..... ...Dell,

Who can't figger out why you don't report changing ignition points when you changed the condensor, they usually come as a set, don't they? and ignition points DEFINATELY affect your sparkies

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ricky

11-19-2002 23:21:17




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 Re: Re: 8n running good cold-missing hot (still no cure) in reply to Dell (WA), 11-19-2002 18:45:58  
thanks for the advice . i'll try the points. and check the voltage
ricky



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DavidO

11-20-2002 04:35:27




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 Re: Re: Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 23:21:17  
Ricky, As Dell and others have indicated, you are going to need a systematic approach to this thing. Measure voltages at specific places under specific conditions, etc. and we should be able to figure this thing out. One thing that I did not see mentioned is how you are starting it. Are you having to jump start it? You mentioned the voltage regulator. Were you having a charging system problem as well, or was this just part of the "shotgun" approach to finding the problem? The reason that I ask these specific questions is that I have seen a lot of instances with cars and tractors where the charging system was not working, the owner would jump start the vehicle, it would run for a while then die. This was caused because the ignition system has to have voltage in order to create sparks for the plugs. If the battery is dead and the charging system is not working, it cannot run. On the tractor, since the generator has to get some current from the battery in order to work, sometimes it will not run if the battery is totally dead, even if the charging system would otherwise be working. So, start with a well charged battery, measure voltage at the top of the coil both when running well and when not running well. Repost and lets take another look.I know that it can be frustrating. Patience is your best tool. Good luck with it.

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ricky

11-20-2002 06:31:52




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 Re: Re: Re: Re: 8n running good cold-missing hot (still no cure) in reply to DavidO, 11-20-2002 04:35:27  
David the battery is fully charged. the battery stays fully charged. i assume the generator is working. no problem turning it over to get started. the voltage regulator was a shotgun thing. i guess towards the end of the day i go to grabbiong at straws. i'll try what everyone suggested and check voltage and post it.
thanks
ricky



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DavidO

11-20-2002 08:35:34




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 Re: Re: Re: Re: Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-20-2002 06:31:52  
OK, that was just one more issue to eliminate. I think that once you post some voltages, we can narrow it down pretty quick.



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Dave Smith

11-19-2002 17:59:22




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 Re: 8n running good cold-missing hot (still no cure) in reply to ricky, 11-19-2002 16:41:09  
Ricky, If the voltage regulator is not working it will not keep the battery charged. Check the voltage at the battery when it is running. If the charging system is working you should read 7 1/4 to 7 1/2 volts. Have you tried removing one plug wire at a time when it was hot to see what cylinders weren't fireing? If a cylinder is fireing ok, when you remove the wire you will get a miss and drop in rpm. What do you have for voltage at the coil with the points open and closed? Should read about 3 1/2 volts with points closed and battery voltage with points open. What is the mechanical condition of the distributer? Shaft, bushings, advance mechanism, etc. Have you given it a compression test when it was hot? Maybe the heat is causing something to expand and hang up (valves).
Dave <*)))><

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