cub smoking

I have a 47 cub that hasn't run on 2 years. starts but smokes on start up, clears up then smokes when I give it throttle. what are possible causes?

The fact that its 63 years old comes to mind.

What color is the smoke?

Did you run it for a while and warm it up after you started it?

My cub does that every spring and it clears up after mowing a few hours with it and I wont see any smoke all summer after that. Think my rings are a little stickey.

pour seafoam in it and go rotary mowing with it, work it hard for a few hours
1/2 in the oil, 1/2 in the gas tank
also adjust the valves on it (won't help the smoking, just needs done)
good luck
Ron

Well, it could be a number of things. Valve guides, stuck rings, broken rings. Most likely, the rings are stuck (or at least some of them).

The suggestion to work it for awhile is a good one. Everyone has their own preferred product for situations like this, and ask 10 people, and you will likely get 10 different answers.

Fresh oil change is a start. If I were working on this one, I would put a small bit of either PB blaster or Marvel Mystery oil into each cylinder through the plug holes (about 1/4 cup), and turn the engine over slowly without the plugs in (with hand crank if you have one. This will coat the cylinders and distribute the penetrating oil). Then I would leave it sit for 1-2 days. Lastly, I wold start it up and run it. Work it. Get it up to temp, and keep working it. When you first start it after putting a penetrant type oil in the cylinders, it will really smoke at first until all the penetrant burns off.

If the rings aren't broken and just stickly that will help clean them up. Valve guides are unlikely, but not impossible. These are valve in block engines, and oil consumption through worn valve guides is less of an issue than valve in head engines.

Let us know how it goes........

If you can confirm, without a doubt, that the tractor was NOT smoking when it was parked 2 years ago, then all it needs is some good hard work to get things limbered up.

Seafoam in the gas. Seafoam in a fresh change of oil. Seafoam sprayed into the intake while the tractor is running. All those will work to clean up carbon deposits and loosen up the rings.