Home › Forum › Ask A Member › ’57 Golden Javelin – fuel consumption question › Re: ’57 Golden Javelin – fuel consumption question
When you run at 3/4 throttle, it’s important to push it to wide open and then back off to 3/4 – this backs off the carb but not the spark advance. The owner’s manual refers to this as "Cruising speed". The 40s from back then worked the same way. If you just run it up to 3/4 without going to WOT first you will use more gas.
If you get the newer design 35 HP, beginning in 1976, you will have better mileage, but the low end torque is not there for planeing the boat and pulling up skiers, especially noticeable on heavy boats like most wood and glass ones. These motors have smaller cylinders.
Like the others said, be sure you have the optimum propeller pitch for your use and load.
Back in the day on Dad’s old 14′ aluminum Crestliner, we used more gas running a 1956 30 HP and later a 1960 40 HP than when the 40 was replaced with a 1965 V4-60 HP. The 30 and 40 were running at WOT almost all the time pulling skiers, while the 60 loafed along at about 2/3 throttle doing the same thing. The V4 60 was heavy for the boat and screwed up handling some, so it was no longer a boat we could let anyone drive.
Dave