Ohio88

Member
Location
Fairborn, Ohio
Have a ford 801 gas that runs great except when under a good load and throttle 3/4 or more. It then beings to spit and sputter. It has fresh tune up and rebuilt carb. The timing is right on. We tried it with a little more advance to no avail. Did the same thing last summer. All the work was done because it hardly ran after setting over winter, so we did the tune up. We also swapped the coil with another 801 and it did not change. It has good fuel flow as far as I can tell. When I remove the plug from the bottom of the carb it has higher flow for the first few minutes and then slows a little. Figure the input isn't as wide open as the hole for the plug. We also changed the fuel shut off as it was restricting flow when tested at the bowl. So I am missing something just don't know what it is. Any ideas?
 
Lets start with the basics.

#1 check and make sure you have a good blue/white spark that jumps a 1/4 inch gap or more at the center wire of the cap and at all 4 plugs

#2 pull the carb drain plug and make sure you have a good steady flow of gas tha twill fill a pint jar in under 3 minutes.
#3 when was the last time you serviced the air cleaner and dumped the mud and water out of it??
Trouble shoot then parts NEVER the other way around ore you can cause more problems.
Does choking it hurt or help?? If it helps you might try opening up the main jet a tad bit more. You should be able to open it up enough to get black smoke if you cannot then you missed something in the carb. If choking it hurts then close the main jet a tad bit till you find that sweet spot
 
To clarify we did all the tune up and carb rebuild because after winter it did not run. After the carb it ran but did not run smooth. Put Plugs points condenser dist cap and rotor. Just normal procedure for me when it does not run correctly. The plugs were not to good. The points had some deteriation. Any way then it ran good except for the problem under load. That is when we swap the coil. In checking Fuel flow we found that it was different each time we opened the shut off. SO we change the shut off. Did not check the flow for volume as you suggested. The vacuum advance does work. Will check flow next time we are not in the field.
 
I have tractors that I have not done a tune up on in over 10 years and they just keep on running just fine. I have an old Oliver S88 that I got around 10-15 years ago and have yet to pop the distributor cap off of it. Pour gas in hit the starter and it is running and most of the other tractors I use are the same way
 
Have you re-checked the points? I had 2 sets that were badly burned within hours, 1 set less than 3 hours! Put in a set of Standard Blue Streak & engine smoothed right out.
 
Had the same problem with my 801, it has a rubber fuel line, what I found as I was running, the fuel line was collapsing on the inside, at low ide it would open back up and run fine, change the rubber line and all was well.
 

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