I work part-time (I do light mechanical stuff - nothing as in-depth or training-sensitive as Rodbolt) at a Marina and we have something similar to what Rodbolt is talking about, although I think our tank is about 30 gallons It's WONDERFUL to use that (and spoils me for when I'm doing work on the side!). But, yeah, it's not exactly something you'd have for 'around the house'. For my side work, I bought a 2-gallon MityVac unit. Same basic principle as what you currently own, but this one actually works well.
But, I digress - you've got something already figured out. The main reason I wanted to chime in was about putting a hose OVER the dipstick tube inside of sticking a little coffee-straw INTO the tube. This is the only I (and our shop) do it. I'm not yet familiar with the Yamaha 4-strokes (we see primarily stern drives and 2-strokes), but with stern drives the dipstick tube goes extremely close to the bottom of the oil pan. It's a much more convenient (faster) way to suck out the oil. As long as your dipstick tube is long enough, you could consider doing the same. If it was a Mercruiser I could tell you that you'd need a 3/8" ID hose - usually fits snug enough that I don't even need a hose clamp - although I do keep one of the hose, just in case.
But, I digress - you've got something already figured out. The main reason I wanted to chime in was about putting a hose OVER the dipstick tube inside of sticking a little coffee-straw INTO the tube. This is the only I (and our shop) do it. I'm not yet familiar with the Yamaha 4-strokes (we see primarily stern drives and 2-strokes), but with stern drives the dipstick tube goes extremely close to the bottom of the oil pan. It's a much more convenient (faster) way to suck out the oil. As long as your dipstick tube is long enough, you could consider doing the same. If it was a Mercruiser I could tell you that you'd need a 3/8" ID hose - usually fits snug enough that I don't even need a hose clamp - although I do keep one of the hose, just in case.
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