2N Carb rebuild....now the bad news....

Starting to smoke like a smudge pot. It always had a small puff of blue smoke here and there before the carb rebuild but this is quite different. When it is idling or not under load at higher RPM it smokes a little. Put a mower on it yesterday and it started smoking like a son of a gun. Looks like oil burning to me but by now EVERYBODY is familiar with my level of expertise.
A couple of things you should know about the tractor.

First, it may have been abused in a prior life. In a nutshell, based on my long experience with 3 point implements and from lift arm condition....too much implement for the tractor and more than once.

Second, I graded our road with the tractor before the carb rebuild and while it was not overly powerful, it did a good job and smoked little.

Third, the oil in this tractor is some of the worst I have ever seen. Blacker than black. I WILL remedy this ASAP but didn't want to do an oil change for a tractor that might need a tear down until after the tear down.

I could use a little direction on how to determine my next course. Is it smoking because the oil has broken down? Are the rings bad? Did I cause this fixing the carb somehow? The tractor loses power quickly after a load is added.
Just need a little guidance. Thanks!

As for the weight of the oil... to me it'd depend on the condition of the engine. If it's original (or an 'old' rebuild), I'd stick with ND30. But... if I'd just rebuilt it (which I did, with mine) I'd run (and do) 10w-40 in it. The compression test would be a good "guesstimator" of the length of time since the last rebuild (assuming you don't already know it), so I might do that before changing the oil (so I'd know what oil to put in it) but I'd definitely change the oil BEFORE running it...

Steve

Anyway, turn the main jet in 1/8-turn at a time until you eliminate the smoke, or at least minimize the smoke. You get to the minimum then put the brake on to load the engine and goose up to 1/2-throttle. It should pick up without hesitation. If it doesn"t, go out another 1/4-turn and try, repeat as needed. When you get there and if it smokes a puff when you goose it then turn the main back in 1/8-turn.

Some of that smoke could be oil but maybe not.

Seriously though...could I ask what mmo is? Chances are if I try to figure it out myself I'll pour something wrong in there.

Now, I think the group let you down here... we should have told you that the first thing that gets done on a NEW-to-YOU tractor, is a full fluid service.. new radiator, new tranny, new crankcase fluid. Unless you sat right their and held the previous owners hand while he did it.

If your oil is indeed way black.. it's old.. and who knows.. with as much carb fiddleing that has been going on.. you may have some pretty thin and well gas diluted oil.. and thin oil sneaks past oil control rings on 50 year old pistons like crazy.

Change your oil.. recheck. Also.. on your carb mainjet. If you are more than 2 turns out.. you are in a real rich neighborhood.

Soundguy