Just wanted to tell you, you were right. Awhile back I posted a question
about jackplates and the setbacks. Well, I had sort of reluctantly
agreed with the rigger at the marina and they put on new jackplate with
a 4 inch setback. The original was was 8 or 10, I do not have it, nor
did I measure it prior to removal.

After getting the boat back, and right way I noticed a significant drop
in performance. At the same RPM, and fuel consumption (via Yamaha fuel
management gauge), I was 6-8 miles per hour slower. During all this, in
the context of another warranty related item, the manufacturer decided
to cover the jackplate under the warranty.

Just got the boat back, with a new 10-inch jackplate and performance is
back to what it was originally. I recently learned more about jackplate
function and theory than I had previously considered. There's a bit more
to it them simply raising the motor up and down.

Thanx again for your help and advice.