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Farmall & IHC Tractors Discussion Forum
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450 carb adjustment

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Chipper

08-15-2007 19:55:11




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Bought a 450 this week and had the bowl off the carb today. Engine is fresh but tractor had pretty much been sitting up for the last 2 years other than the occasional crank and stroll around the lot. It didn't want to seem to open up as much as I thought it should when I got it. It than began to run ruff and flood and then clear up. It would then hang up and stay at one particular rpm reading regardless of where the throttle was. I pulled the bowl off today and everything internally looked pretty clean except the needle would stick just a little in the seat. A light tap would free it. I went ahead and put a new needle and seat in and cleaned the screen on the fuel supply line which was almost stopped up. I put it back together and cranked it but still isn't running right. What's the standard setting on the idle mixture, throttle stop and fuel setting screw? I've also got to check to see if the governor is gummed up anywhere.

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CNKS

08-16-2007 18:11:20




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 Re: 450 carb adjustment in reply to Chipper, 08-15-2007 19:55:11  
Assuming it is the carb, clean it in carb cleaner, blow out with compressed air and put a kit in it. I don't have a 450, so I can't give specific idle mixture starting settings, but basically you set the idle stop screw so that it has enough rpm to run smoothly, then adjust the idle mixture so that it doesn't stumble. The main jet is a fixed jet with a "cut" needle you can turn in when you don't need max power for light loads (better fuel economy). For full loads the setting is 5 turns out, the needle is well off the seat at that setting, actually it is completely out of the jet. I don't think you will see any black smoke. You do not adjust the main jet like you do on the M.

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old

08-15-2007 21:22:32




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 Re: 450 carb adjustment in reply to Chipper, 08-15-2007 19:55:11  
Main jet should be set around 4 or 5 turns out from bottom. Then from there you adjust to get the most power with out black smoke



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