This (2003 Sundeck 217) is my first boat (4 times on the lake so far), and none of the others I've driven were anything like it as far as being outboard and a similar size engine or hull. The Yamaha 150 (V6 TXRB two stroke, apparently a standard offering with the boat when it was new) was hesitating a bit here and there at first, and the previous owner said that was how it felt the first time out every year (didn't sound like he'd been putting anything special in the fuel tank over the dormant winter months). Sure enough after an hour most of that went away (and with some SeaFoam in the tank the next time out). Since he couldn't recall having changed the spark plugs, I thought a new set might be the thing to get rid of any residual hesitation. That also proved true (though none of the old plugs looked particularly bad), as it now has no intermittent hiccups that I can feel. What it does seem to have is sort of a flat spot somewhere around the upper 3000 rpm region. Throttling it up pushes right through and it feels OK after that. I haven't driven anything with carburettors in many years, so I've sort of forgotten what it was like before EFI. Perhaps it's just me. I checked several times yesterday with a GPS device and it held a maximum speed with 4 people on board and fairly smooth water of 38mph every time (I'm still learning about optimum trim, however).
So what do you think? Is that behavior just a "feature" of that engine as you throttle past some particular point? Or is there something out of whack that I need to check into? Previous owner claimed to have zipped along at 45mph or better with 2 on board, but he was going by the (not currently functioning) speedometer, which might have been optimistic. I bought a bottle of Ring Free but haven't added it yet as I've used less than 1/4 of the (64 gallon!) tank since I added the SeaFoam.
Oh yeah, one other question... seeing as how Yamalube and a few other "premium" oils cost a lot more than most other TC-W3 rated oils, how much of the difference is really helpful and how much is just hype?
2003 Sundeck 217 OB, Yamaha 150 2 Stroke
"I will not be pushed, filed, stamped, indexed, briefed,
debriefed, or numbered. My life is my own." - Number 6