Well, finally had the time to get out on the lake. I had found the break in procedure from Johnson. Did my 4 hrs idle in a tub in driveway. Then 30 min idle in drive. Got in 30 of 60 min at 3500 or less then rain was coming. So goosed it to get off the lake. From idle this thing certainly has some snap! Topped out at 20-21 mph. Stock was 12-14mph. My other 9.9 with the stock square tuner and the 15hp carb got 17-19. Might re prop as this one has some dings and has rock flexed the wrong direction since 75.....