I recently bought a Roybi 4 cycle line trimmer and it smokes so much when I use it that I have to stop. What's up with that?

Lonnie, One thing to check, make sure oil level is correct. Too much will cause unit to smoke. Otherwise it may have internal issues. Hope this helps.

If you bought it from Austin outdoor power it should still be under warranty if you bought it new !!

Ooops my bad, i didnt read its a 4 cycle. Unsure what the issue is. There arent that many possibilities. Sorry.