The only time you will save fuel with smaller engine is idling in Neutral. The larger engines will match the smaller one's WOT Speed, at part throttle and usually be burning less fuel doing so.
If the timing has retarded, the throttle plates may have been opened to regain the Idle Speed, that by itself is major cause of Dieseling. I will assume it has Electronic Ignition, so no Points to wear, but the timing will retard as the Timing Chain wears and stretches.
If you really want to upgrade, ditch the Springs and get a Torsion Axle. It is basically an Independent Suspension. I changed to a Torsion Axle in 20015, and it is a much nicer towing experience
You need to verify that the Spark can jump a 7'16" gap repeatedly. If it can't then there is a Problem. Check all connections, and grounds, including those to the engine block
This one is a long shot, but it can cause Difficulty in starting. A bad Crankshaft Seal under the Flywheel.
On my I/O the Sending unit is quite a ways back on the tank(makes for a very inaccurate fuel gauge) and is about 2 ft forward of the front of the engine itself, pretty much under the front of the Bench Seat
With the Engine Cover/Sunpad open, can you see the Fuel Lines, and Fuel Fill Hose/Pipe go under the Floor/Deck? If so, can you get a Mirror and Light down there to try and see the location of the Sending unit?
Lake Boating where the waves get a little nasty is where I boat. The Boat actually holds 22(statue)mph very well. I run at that speed a lot as it allows me to stand up and get some cooling on Hot Days, 20c and above. It is propped to hit the upper end of it's rpm range, with a 1.51:1 gearbox. It...
Small engines have to spin higher Rpms to get the same power that a bigger engine gets at lower rpm. The Extra Torque from the greater Displacement is what bigger boats need most. Given a Choice between a 220hp 4.3 and a 220hp 5 Liter, I will take the 5 liter(though I consider it too small for...
I agree, with Bondo. Nothing Less than a 5.7 in 21 footer. It is less likely to take forever to get on plane, and it will have a Higher Top End which is always nice if you have to get somewhere in a hurry, or away from a Storm
Since you didn't put the Trailer on the Ball, you might not have a ground, often the ground wire to the Tow Vehicle breaks but the Lights still work, cause it is using the Hitch to complete the Circuit. 50 yrs ago my Dad never used a 4 pin connecter for trailer wiring, He used the 3 Prang...
It is a Prop for an OMC outboard, it is not an OMC Prop.
Michigan Prop 4 blade 10" Dia 11" Pitch. It would fit on the Big Twin type of Outboards; 25hp(1951-55), 28hp, 30hp(1956), 35hp(1957-59), and 40hp(1960-76, and the later commercial models).
Before you spend money on another gearcase, make sure the Powerhead is not damaged. Scored Cylinders/Pistons and warped Heads are common Features of overheated engines. I suspect that Overheating would be one of the reasons the previous owner sold it
