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Smokes under power...

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I just recently bought a 1973 Simplicity 9020 (with the help of several people here)and it seems to run great most of the time. It starts runs and idles with no problem. It has a 4' brush hog that works fine in my field of 3-4' grass & weeds as long as I am in 1st gear. My main problem is that as long as I am in 1st gear it works fine. When I am in 2nd or 3rd, there is no smoke on level ground. As soon as I try to climb a hill it starts to smoke, and bogs down to the point that I think it might stall. 1st gear is fine on hills, and no smoke. Can anyone help? Oh.. BTW... this is an Onan 19.5 HP Thank You, -Matt

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Sounds like a rich burn problem to me also.. What color is the smoke ? Blue is oil, White is water or kerosene ( it happens LOL ) slate gray means to much gas. If its blue smoke, make sure your not overfull on oil. If its gray, I would do what the post before this one says and also set the float level.

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