Posted by Bill(Wis) on January 27, 2023 at 15:18:28 from (67.86.36.109):
In Reply to: Ford 8N mystery posted by Jonesy54 on January 27, 2023 at 13:31:16:
This from the dearly departed Dell Golightly: ''It ain't how many turns that count in adjusting a carburetor. Each carb and engine is uniquely different. That's why thar's them handy-dandy fiddle screws on your carb. Can you tell the difference between the idle mixture and the main jet mixture screws? Can you tell where the low speed idle set screw is? Can you tell which governor rod connects to the carb throttle shaft? Ford owners manual sez to set BOTH the idle mixture and the main jet to 1 turn. Well that works on a new carb and a new engine. I don't think your tractor qualifies. Therefore, I suggest 1-1/2 turns for both the idle mixture and the main jet. After you get your engine started and fully warmed up (about 15 minutes), adjust the idle mixture for MAXIMUM RPMs, not maximum smoothness, understand? MAX IDLE RPMs. Tractor idle spec is 450 RPMs which is awfull slow to our ears. If your carb is anywhere near being right, you can do it. Now then, goose your throttle. If engine doesn't respond, enrich the mainjet 1/8 turn. Do it again. You may have to go out 2 turns on the main jet but no more. Learn how to read your sparkies color. After idling for 15 minutes, pull a plug. It should be a light tan or gray color. If it is sooty black you're too rich. If it is clean white, you're too lean. But most important, adjust idle mixture for MAX RPMs. Then, go plow or do heavy work for a few minutes at high RPMs and pull a sparkie and read the color. That will tell you how well you've adjusted your main jet. From the black art of adjusting carbs.......Dell
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