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Ford 9N, 2N & 8N Discussion Forum
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Boggs Under Load

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ZoSo

04-03-2007 11:53:26




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Help if you can, One day gas started flowing out of what i believe is the air intake hole on the carb. So I followed the instructions that i got from this web site and rebuilt the carb. (A little history, it wasn't running all that great before the gas flowed out.) After rebuilding the carb i was having a hard time getting it to stay running. Then i replaced the alternator, battery, dist cap, rotor, sparkies, points, condenser, spark wires, check and cleaned all electrical connections. Now when i start it it runs fine when it is just sitting there. It runs fine when driving. Runs fine when not in gear with the bush hog engaged. But if i try to cut grass it boggs down and kills as soon as i lower the bush hog to cut. Some time when it starts to bogg down i can get the clutch pushed in time to keep it running. I'm thinking that maybe when i rebuilt the carb i didn't do such a good job (being a newbie) Maybe a prob w/ the float setting or something, i'm not sure. Any thoughts would be greatly appreciated. Thx

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herb storrs

04-03-2007 15:35:17




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
Bogging under load can be a sign of a really wornout engine, that can run fine at idle and low loads, but just can"t put out full power anymore. Bush Hogs take a LOT of power to run, and a lot more than, say, sickle mowing, so when you are running a bush hog on a worn engine just a slight hill or heavier grass can make them bog down.

It can also be a symptom of stuck rings if the tractor has been sitting a lot, since stuck rings behave pretty much like worn ones.

If its stuck rings are the problem dumping a quart of Marvel Mistery Oil may produce a miracle cure.

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ZoSo

04-03-2007 15:45:27




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 Re: Boggs Under Load in reply to herb storrs, 04-03-2007 15:35:17  
Herb, you say dumb a quart of marvel, this may sound like a stupid question, do i add it to the oil in the crank case?
ZoSo



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Paul Pa.

04-03-2007 13:58:53




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
ZOso,have you tried removeing the drain plug in the bottom of the float bowl to check for a good steady fuel flow? You may be starving for gas under load. Paul



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Joe (IN)

04-03-2007 13:25:49




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
Have you tried advancing the timing a little bit?



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RP-40-9n

04-03-2007 13:04:33




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
have you looked at the mower blades to see if they are sharp. sounds to me like tractor is runnin ok, but the cuttin aint so good. if blades are sharp, try runnin in lower gear with higher rpms. RP



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JoePilot

04-03-2007 12:40:59




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
Have you checked the governer? I don't know the procedure, but I'm sure you can find it in the archives...

If it is not working, that would surely cause it to bog down under load...

Joe



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CENTAUR

04-03-2007 12:40:36




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
To adjust carburetor correctly.Transmission in neutral and brakes locked open throttle to max RPMs and turn large knob which is the high speed circuit CW to lean it and CCW to enrichen it.It should have a feel in it.Turn it in till it just wants to begin to drop in RPMs.With this setting it will consume a gallen a hour pulling the maximum load if the air cleaner is clean and the timing is right. CENTAUR

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old

04-03-2007 12:14:43




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
First off does it help to choke the engine when it starts to bog down on you?? If it does then most likely you have the carb set to lean. If it doesn't help then you need to recheck how good or bad your spark is. You need a good brite blue/white spark and it should jump a 3/16-1/4 inch gap. Also check/clean out your air cleaner. If its real dirty or doesn't have the right amount of oil in it that can cause funny problems also

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ZoSo

04-03-2007 13:09:47




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 Re: Boggs Under Load in reply to old, 04-03-2007 12:14:43  
I'll check the air cleaner and oil level in it.
Thx



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old

04-03-2007 12:13:46




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
First off does it help to choke the engine when it starts to bog down on you?? If it does then most likely you have the carb set to lean. If it doesn't help then you need to recheck how good or bad your spark is. You need a good brite blue/white spark and it should jump a 3/16-1/4 inch gap.

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ZoSo

04-03-2007 12:19:08




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 Re: Boggs Under Load in reply to old, 04-03-2007 12:13:46  
No choking doesn't help



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hunting4junk

04-03-2007 12:08:56




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
sounds like you need to adjust the load srcew on the carb. It should be brass colored and about the same diameter as a dime and will be located at the front upper edge of the carb (towards the radiator)start out with it about1 to 2 turns out from bottomed out and try your bush hog if it still wants to die turn it out a 1/2 turn and try it again.



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ZoSo

04-03-2007 12:17:32




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 Re: Boggs Under Load in reply to hunting4junk, 04-03-2007 12:08:56  
Tried doing that but it didn't really make any difference at all. Got the lean/rich set a 1 1/2 turns from bottom and started the load srcew at 1 1/2 turns and tried backing off a little at a time but no noticeable difference.
Thx
ZoSo



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A. Bohemian

04-03-2007 12:07:37




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 A Few Thoughts in reply to ZoSo, 04-03-2007 11:53:26  
(1) Re-check the gap on the plugs. Bad plugs often miss under load in my experience.

(2) When you pull the plugs, if one is fouled already you may have a compression problem. Engines with bad rings will often idle well and rev well but not pull a load. They will often run rough and be hard to start when other components are marginal, but start and run much better when the other components have been renewed.

(3) If you can find one, take the carb off a good running tractor and sub it out for yours. It doesn"t have to run perfectly, just make sure it can pull a load. If it does, the problem is not likely to be the carb.

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ZoSo

04-03-2007 12:14:42




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 Re: A Few Thoughts in reply to A. Bohemian, 04-03-2007 12:07:37  
When i get home i will pull one of the plugs to see if it is filed or not. If it is i guess i move on to the compression test.



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Drat!

04-03-2007 12:09:24




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 Re: A Few Thoughts in reply to A. Bohemian, 04-03-2007 12:07:37  
Obviously, I meant to say that if the tractor will NOT pull a load with the substitute carb, the problem is NOT likely to be the carb.

Sorry.



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8N'r--WI

04-03-2007 12:07:00




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 11:53:26  
ZoSo--Wow!! lots of new parts ($$$$)--IF your carb was rebuilt correctly--lets look for a simple fix first---have you checked to see if you have the plug wires in correct firing order? From the front by the radiator it should be 1,2,4,3.

It is easy to get the last two plug wires closest to the driver backwards---would cause you to lose power under the load---start by checking with that and post back----Tim

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ZoSo

04-03-2007 12:12:21




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 Re: Boggs Under Load in reply to 8N'r--WI, 04-03-2007 12:07:00  
I set the gap in the plugs and the points @ .025. Is this correct?
I have the firing order 1,2,4,3



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8N'r--WI

04-03-2007 12:15:08




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 12:12:21  
Plugs should be gapped at .025

Points --front mount dist. are gapped at .015

--side mount dist. are gapped at .025



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ZoSo

04-03-2007 12:23:47




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 Re: Boggs Under Load in reply to 8N'r--WI, 04-03-2007 12:15:08  
I have a side mount
Thx



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8N'r--WI

04-03-2007 12:33:06




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 12:23:47  
Ok--now you got me thinking--

You write-- "Now when i start it it runs fine when it is just sitting there. It runs fine when driving. Runs fine when not in gear with the bush hog engaged. But if i try to cut grass it boggs down and kills as soon as i lower the bush hog to cut. Some time when it starts to bogg down i can get the clutch pushed in time to keep it running."

How big of a brush hog are you using, what are you cutting with it, and how short are you cutting it?

My 51 8N with a fresh rebuild on the engine will bog down in 6' tall elderberry brush if I try to take a full cut with my 5' Brush Hog. I have to take a smaller cut in order for the tractor not to bog down---Tim

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ZoSo

04-03-2007 13:06:40




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 Re: Boggs Under Load in reply to 8N'r--WI, 04-03-2007 12:33:06  
Tim, I'm using a 4' bush hog and the grass that I am cutting is not that high. It also boggs if i put the 4' grade box on it and try dragging some dirt around. Thx



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Ross Pugh(NC)

04-03-2007 15:15:26




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 13:06:40  
I am assuming ye are not in a high gear. If so put it in 1st gear and see if that helps. If not it sounds like ye govenor is not working. with the tractor at idle speed and in neutral and running, take hold of the govenor control rod, the one going from the carburetor to the govenor toward the front of the engine, and move this rod forward or backward and see if it pushes back on you, if not the governor is not working as it should. Wwhen the engine gets in a strain the govenor should work and keep it running.

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Ross Pugh(NC)

04-03-2007 15:14:45




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 Re: Boggs Under Load in reply to ZoSo, 04-03-2007 13:06:40  
I am assuming ye are not in a high gear. If so put it in 1st gear and see if that helps. If not it sounds like ye govenor is not working. with the tractor at idle speed and in neutral and running, take hold of the govenor control rod, the one going from the carburetor to the govenor toward the front of the engine, and move this rod forward or backward and see if it pushes back on you, if not the governor is not working as it should. Wwhen the engine gets in a strain the govenor should work and keep it running.

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