Re: Altutitude chart for 77' 75hp Evinrude
Hooty,<br /><br />Thanks very much for the chart. The reason I'm asking all these questions is that I changed the jets when I moved to Utah. The motor trolls great and runs great on plane, but it has problems getting on plan while pulling a skier after about half an hour. Since I did have the large low speed jets I though that more fuel was being poured into the carbs at idle. Not enough to flood the engine, but enough to allow fuel to pool up at the bottom of the carb throat. I figured when I tried to take off all that extra fuel that had been slowly pooling in the throat was being sucked into the engine as well as the fuel from the high speed jet causing the engine to flood. Anyhow, I went back to standard low speed jet size and will try the engine as soon as the weather allows. It's a little cold now.<br /><br />Clayton,<br /><br />Here is a basic description of the carb. It has a fat tube (high speed) and a skinny tube inside the fat tube (low speed) that sit in the carb bowl. The fat tube feeds right up into the throat of the carb. The skinny tube runs up to the top of the carb where the low speed jet is located. Fuel from the skinny tube runs through the low speed jet and back to three small holes at the top of the carb just aft of the throat.<br /><br />Thanks again for the advice. I can't wait until spring.
