This is a demonstration of how to change the oil and lower unit lube on a 90hp Yamaha four stroke. I've done this service on my boats for close to 20 years on OMC, Mercruiser, and Yamaha motors/outdrives. Fishing with David Pyle..
Bob, I'm so happy to hear that you liked the video. Check out this newer version: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-u3qdbjgp1Vk.html&feature=emb_title
James, you're vey welcome. We all have to learn somewhere and a lot of that comes from getting out and experimenting. I wish you the best of luck this season and I'm so happy to hear that you've found some helpful information in my videos.
Just a FYI,Yamaha suggest replacing the crush washers on the lower unit drain screws per the manual,and there's a bunch of other stuff to check,but that's your call.
Jay, the garden hose connection should not be used when starting the motor. That connection should only be used to run fresh water through your motor while the motor is OFF. My goal was to heat up the oil and lube so it could drain faster.
This is kind of a random question. I have the same motor and am trying to replace the internal anodes, but am having trouble locating them. I have the schematics for the motor but they aren't very helpful. Would you happen to know where they are located?
Thank you. Search Amazon for Ear Muffs outboard. Any of those will work fine. Search Yamalube gear case lube (SAE 90 80W90). Finally, search Yamalube pump assy (quart size). Go to my website, www.FishingWithDavidPyle.com, hover over Videos and select "How-To". Look at my most recent video at the bottom which is even better for changing the oil, lower unit, fuel filter and water fuel separator.
Anyone that watches this for their own f90. Just sell the motor. The water passages in the block will corrode until the cylinders get water leaking into them. The Yamaha, the Mercurys, they both do it "The more you know..."
That may be true but I have had mine for many years and it still runs absolutely perfectly. I have always performed proper recommended maintenance and run fresh water after use.
You'll want to remove your engine cover and the amount of oil is usually on a sticker. If not, consult your owners manual. For my F90 it was approximatley 4 quarts.
