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Farmall & IHC Tractors Discussion Forum
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Super A hard starting and Carb Question

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SteveNH

02-19-2008 10:25:52




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My 48 SA has a carter carb. When I try to start it I need to choke it and then if it catches I need to quickly un-choke it and hope it runs. I need to use 12V for this to get it cranking good and fast too. If after a few turns it doesn"t start and I stop cranking a lot of gas seems to pour out of the carb. When I pull the plugs they are bone dry so it looks like no fuel is getting up there. The float seems OK and once it is running it seems OK and doesn"t leak. What causes this? I am sure this is what is leading to my hard start problem. I tried spaying starting fluid in the carb and had no luck.

I got a rebuild kit from TSC but it really didn"t have that much in it.

I found a used Zenith carb for sale at a tractor salvage yard - is the choke and governor linkage in the same place as the Carter setup? How about the fuel line hookup? Not sure if it is a direct swap or not.

Once it starts it idles and runs decent besides smoking a lot which appears to be oil since the smoke has a blueish color to it.

Could my valves be out of whack? Maybe a small air leak somewhere? After it has been running for a while and I pull the plugs they are all carboned up, which is most likely from the oil burning problem. I have great spark still though.

Thanks.

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SteveNH

02-20-2008 09:20:33




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 Re: Super A hard starting and Carb Question in reply to SteveNH, 02-19-2008 10:25:52  
Thanks again guys. I will take the carb apart again and make sure everything looks correct. My compression is 115 give or take a pound or two in all 4 cylinders. I ordered some new gaskets so I am going to try that along with the re-cleaning of the carb. I also found a zenith carb that should be on its way so I can try that out as well.

I guess I should add that I really haven"t worked the tractor too hard and they guy I got it from let it sit for 2+ years - I did clean the carb out when I got it and changed the fluids. I picked up a 6" york rake and wanted to get everything in check so I can be ready to go after all the snow is gone.

Thanks for the info on the choke. I will try that when I get everything back together.

Would Napa carry a valve cover gasket?

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Dave from Texas

02-19-2008 13:33:06




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 Re: Super A hard starting and Carb Question in reply to SteveNH, 02-19-2008 10:25:52  
I have the same problem on a Cub. I have cleaned the carb. and set the float several time. It has strong vacuum but plugs are dry as have stated.



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Hugh MacKay

02-19-2008 13:22:00




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 Re: Super A hard starting and Carb Question in reply to SteveNH, 02-19-2008 10:25:52  
Steve: I'm not going to go into possible poor rings, vacume leak, etc. Those one or more items may well be your problem. Oil consumption is also an opinion, how much oil will the tractor use on an 8 hour day? Black or blue smoke mean nothing to me when an engine is cold. What is the compression in each cylinder? If you don't burn more than a quart of oil on an 8 hour day, and if your compression is over 100# each and every cylinder, your engine is fine. I'm running a 130 here with poorer stats, and it will chase the SA damned hard on a cold morning start.

You don't need 12 volts to crank that little tractor. You must have poor battery, poor connections, too small cables or starter problems.

My Super A has been starting as you describe for at least 35 years. These little engnes equipped with a Carter carb are a tempermental little beast. I never touch my choke until the tractor is cranking, then it's only a quick jab out and back in again. I probably will feather the choke again if necessary to keep it running. Plain and simple you are using too much choke, there lies the reason for the massive discharge of gas. In short, I will challange anyone, to meet on common ground at -30F. I guarentee you, my little 6 volt SA will be up and running with any gasser from anywhere. You just have to learn, not to be so generous with that choke.

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DLJ in NC

02-19-2008 12:19:55




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 Re: Super A hard starting and Carb Question in reply to SteveNH, 02-19-2008 10:25:52  
As far as the Carb problem. The needle sticking or th efloat being mispositioned can cause the fuel to not get sucked up even with good vaccum. It can also cause the massive running out of the carb that you described. I would very simply take the whole carb apart (jet as well) and clean first for that problem. That may cure more problems than not, then take a look at your oil burning issue.



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Janicholson

02-19-2008 10:56:48




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 Re: Super A hard starting and Carb Question in reply to SteveNH, 02-19-2008 10:25:52  
The issue is probably the lack of vacuum when cranking (rings) that reduces the flow of intake through the carb enough to make it difficult to start. If the rings are worn, the best tactic is to replace the cylinder sleeves and pistons, check the crank for size and put in new bearings. The sleeves are wet, which means easy enough to do as a first time project. We can help.
Another issue might be a vacuum leak, but less likely.
If the rings are just stuck, Pulling the spark plugs, and filling the chambers with about a half cup of auto trans fluid (putting the plugs back in loose) for two weeks, then (removing the plugs) cranking it to blow excess out the spark plug holes. This can free up stuck rings, costs $2 and two weeks. If it doesnt help with the issue, I wager it will take the rebuild (about 600 when all is said and done, doing the work yourself)
A vacuum chack simple to make is to hold your palm over the air intake on the carb (hose off) and have some one crank it (safe out of gear brakes locked etc.) if it pulls in on your hand massively, it may be OK in the vacuum department. Keep us informed, JimN

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