Stick 40,I've had one in my Pulse 125 and haven't had a single problem yet with about two and a half gallons through it.It's probably one of best running enginesI have,easy to start after the first start of the day,and I don't think I've touched the needles since I first ran it on a test stand,I run mine on 100LL and Stihl dino oil at 32:1 have since day one.Good luck with yours.Just run it,you've got nothing to lose.

Later Jim



Later Jim