I tried this in another area, and got no responce, so I am trying here (where I've had lots of luck before)
I have a little 100 that burns oil and smokes. I'm thinking if I buy new rings it should be fixed. Any ideas? It has a lot of power so I don't think it more, but I want some opinions. I don't know if I'd know by looking at everything whether they were good or not when I get it apart.

 

Well with the 4 stroke 100 it may not just be your rings. It could also be your valve stem seals. You would have to pull the head to have that checked. Good luck.

--Dave

 

Do a compression test first. If the compression is low, even though it still runs good, it is probably your rings. If the compression is good, then I would look more into the valve seals like Davesp mentioned

 

Thanks for the help!
gets me on the right path.