Ranchero50,
Loading the pump is a little different for each type of jet.
I understand the spoon idea on inboard. But the water flows (for the most part) in one direction. In an outboard the water is sucked into a bowl and forced to change directions. I do agree that the faster more...
inboard vs outboard
"my theory"
the point at which the pump loads has to make a huge difference. As a inboard pump loads about 2 feet in front of the transom and the outboard is 4-6 inches behind the transom. If an inboard is bouncing (porposing) it cant load the pump. No water in pump...
(That doesn't make a whole lot of sense, theoreticly it seems the boat crashing back into the water would slow it down vs. finding the fine spot on trim right before it porposes. I've never seen a boat set up like that.
Mine when it was porposing felt wilder but not really faster. When I trim...
The "porposing" gains speed. The less the boat is in the water the less drag it has. On a GPS, it will usually gain 1.5-3 mph.
not recomended for cruising (like riding a bucking bull)
I have never really measured MPG.
This past saturday we traveled between 50-55 miles. I used around 9-10 gallons of gas. So that would somewhere between 5 and 6 gallons per mile.
40 hp
make sure it has a short shaft of 15". They will work on 22" transom.
the 2 cylinder Johnson/Evinrude (most bang for buck)
40 hp yamaha
some of the newer 40 hp mercurys have a 15in midsection on them that create pretty good power. Make sure that it is looper motor not a crossflow...
hmmm....
the newer 70hp is more powerful than the older 70hp, but...one wore out 70hp is probably not much better than another wore out 70 hp.
I would only be concerned if the difference in all three compressions were more than 10psi. if the top is 90 psi, and the others are 100+ then it...
my guess its clogged. Look at where the water exits the rear of the pump. Sometimes a rock will lodge betwee the exhaust tube and the pump wall.
Make sure your reverse gate is manovering properly. sometimes the linkage will adjust itself over time and allow it to come up and block the water...
too high!
the slightest measurement can make all the difference. i would try to lower it just a little (1/8 of inch) and see. most of the time you can do that by loosening your bolts and the motor will drop slightly, then tighten them back up.
current river marine is very good about getting...