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Farmall & IHC Tractors Discussion Forum

Re: Farmall 300 carb issues

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pete 23

11-17-2019 11:45:41

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Time with light at full throttle to 22 degrees before top dead center. If dist is in good condition, then the timing will retard to close to top dead center at low idle speed. If you try timing to top dead center at idle without making sure full advance is 22 at full throttle you will be no better off than you are now.

Carburetor is not the same as an M as it has different idle circuit. If it still smokes at low idle and not at higher speeds, most likely the idle jet inside (the long, skinny, jet with the tiny hole) is damaged or even missing.

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11-17-2019 13:42:00

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 Re: Farmall 300 carb issues in reply to pete 23, 11-17-2019 11:45:41  
There are 3 marks on my front pulley, two close together and one further away. I think the middle one is 22 degrees. At full throttle the timing is exactly on the 22 degree mark. At idle (which is still a little higher than Id like) it is at about 10 degrees.

I replaced the idle jet as the kit came with a new one, although I had this issue with the previous one. Thanks, Sam

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