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Farmall & IHC Tractors Discussion Board |
Re: Re: Re: Dwell setting question
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Posted by IHank on February 27, 2000 at 22:16:01 from (167.142.10.35):
In Reply to: Re: Re: Dwell setting question posted by Dan 130 on February 27, 2000 at 15:55:42:
Dan- You describe a problem with a many possible causes. Yes, get the ignition squared away. Watch out for some of this gasoline that is doped up toward smog ends. I've had a brand new set of plugs go bad before I got the job out the door because of the crap the customer had in the fuel tank! Get the air cleaner & that system up to specs. Make sure the cooling system thermostat is holding the engine at a constant temperature. Run the thing around a bit and warm it up. Then, pull the throttle to wide open and adjust the carburetor main mixture screw for peak RPM and smoothest operation, then leave it at the rich (open) end of the peak range of the adjustment. Next go to closed throttle idle and let it settle down. Trim the idle speed screw as needed to get proper idle RPM. Then, trim the idle mixture screw for peak idle speed and smoothest running. From there, grope around on that adjustment and stop at the rich end of the adjustment that gives the best idle. Re- trim the idle speed screw if needed, then re-trim the idle mixture if you had to change the speed screw. Yes, it's a back & forth hunting for the right combination of screw settings! Keep in mind that all this is based on you having a carburetor that is in proper working order and "good" fuel. In general, that hesitation on acceleration is usually a combination of weak ignition power, lean fuel mixture. Sometimes it is caused by lousy fuel and the owner went thru lots of work and money repairing carb. & ign. stuff that was not the real source of the problem. Drain the tank, put that fuel in your car or pick-em up, and re-fill with fresh fuel that you know is "good". When the car or pickup then runs lousy you got an answer... Good luck!
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