Without muff mod, 14-14.5. With muff mod, could be anywhere from 14-15.5. You have to find that sweet spot in the cut. this may require you to remove the limiter caps on the H and L jets. Always get the saw hot before tuning, then tune with a tach to close to what it should be. then put the saw into a log and turn the H screw each way 1/8 turn at a time till you find the sweet spot in the powerband.