How to swap and clean your Yamaha fuel injectors

The Yamaha F-115 has been a solid engine for the last 17 or so years but like any 'machine' no matter how well they are built, they will eventually suffer from entropy.. parts will wear out and need to be replaced or maintained.


It has been a little over a year since I had taken my Yamaha 115 4-stroke in for it's 100 hour annual maintenance schedule. I was actually well past the schedule but I had the lower unit oil changed, new impeller and new fuel injectors plus some other minor stuff done. $950 later, I got the Key West back and my first test run was about 15 minutes long. When I opened the Yamaha up, she bogged down and I had to limp back to the ramp. $350 later and a second set of 'new' fuel injectors and I was good to go. But, I was determined NOT to get taken to the cleaners again and would learn to do MOST of my own maintenance.
Recently, my Yamaha has been stalling when I get out to a spot and throttle down with the motor still warm. Occasionally, she would be slow to start and somewhat rough at idle and this last trip back in, when I had to use SeaTow (whom I highly recommend) to make it back to the ramp, I began a 2 week crash course in learning to change my own INTERNAL anodes and give my outboard a PROPER flush with a descaling agent. Plus, I was determined to change my own fuel injectors and clean and recondition my old ones so I will never be in need of clean ready to go fuel injectors. I am now confident that I can change my fuel injectors on my F-115 in 10 minutes from start to finish.



In an upcoming video I will do an outboard motor CHEMICAL flush to remove built up scale, a water pump install on the F-115 and a drain and refill of the lower unit oil.