I just bought a new to me 2000 Yamaha F100 four-stroke. I have never owned a four-stroke so I am wondering if I need to re-jet the carbs for high altitude. The lowest altitude I run the motor at is 3000 feet and the highest is at 8900 feet. With my 1994 Mercury 115 hp 2 stroke I noticed a difference in changing the jets from sea level to around 3000 feet sizing, but I am not sure if I need to do that with this new motor. I cannot seem to find a chart anywhere for the jet sizing by altitude for this motor. Any help will be greatly appreciated. I have a couple of different sized props to see what works best at the high altitude lake so that isn't an issue.
I am going through the motor this winter doing all the maintenance so I can be ready for the Spring fishing for big Lake Trout.
I am going through the motor this winter doing all the maintenance so I can be ready for the Spring fishing for big Lake Trout.