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Jeff, When the engine is idling it is consuming the minimum amount of fuel and requires the minimum amount of compression. When you start to work it, it needs compression to make the fuel function, and more fuel to feed the beast. Additionally is timing which requires the spark to be available at the right time to "coax" the engine to run with the load; hence timing is usually Before Top Dead Center. I am not an Oliver guy but have a couple of ideas. First if you can find your high speed jet on your carb, open it a half turn at a time and see if this "richer" mixture helps. If not, put it back. Secondly rev your tractor up to PTO rpm's (1600 or thereabouts) and loosen your distributor. Turn it CW till the engine starts missing and then CCW till it again starts missing and return it and lock it down at the mid point between these two settings. If that fails, drop your carb bowl (bottom half) and with your finger hold your carb's float up to where it is parallel with the casting of the carb. There should be no fuel coming out of the carb. Then allow the float to fall whereupon you should get a running of gas out of the carb; not a dribble. If you have a run it's ok. If a dribble, something is restricting your fuel between the fuel tank and the bowl. Come back with your answers. Mark
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