I will check that. Also, you undersood correctly that there is no smoke revving free. I should have included that. I'll fix it in the orginal post.
Originally Posted by JSL3
Max RPM I could achive under load was 2700 (that would only drive the boat at aprox 4.5 knots), normal max rpm under load is over 3100 rpm (which will normally drive the boat at just over 6 knots)
At 2700 RPM thick black smoke would come out of the exhaust, if I backed down to 2500 RPM smoke went away and speed woud drop to 4 knots or so
Plenty of water in the exhaust
Back in the slip, in neutral I could max the RPMs out at 3400 or even higher with no black smoke.