Hmm. It just dawned on me that he may not even realize his bike is a two stroke. He told me the oil filter is probably clogged, but that it's OK if you put some oil in the gas tank. Now I have never had any experience with 2-strokes, but a few minutes of googling indicates that 2 strokes don't have oil filters and there is a pretty specific ratio of gas to oil that needs to be upheld.
Anyway, I recall the bike being pretty smokey when it last ran. I think he may be putting the wrong amount of oil. What ratio of gas to oil do ya'll use?
And what could be damaged by running the wrong ratio of gas to oil?