175 hpdi ?

[BassManGuy]

I think the Yam website is incorrect. Owner's manual shows 5500 as the redline. Never seen a Yam before with a 1500 RPM range either . OM shows a 4500 - 5500 range.

Being propped to get to the top of the RPM range is good. Just don't allow the motor to go the redline, if it will.

? Yamaha made that owner's manual, so if anything, the owner's manual would be wrong. I know there is a rev limiter, if that's what you mean by redline. I run my Yamaha well over 5500 rpms, as many others do as well. There is a recommended rpm range. There is a rev limiter, and if you were to hit the rev limited, the motor would alarm.

[jethro1]

? Yamaha made that owner's manual, so if anything, the owner's manual would be wrong. I know there is a rev limiter, if that's what you mean by redline. I run my Yamaha well over 5500 rpms, as many others do as well. There is a recommended rpm range. There is a rev limiter, and if you were to hit the rev limited, the motor would alarm.

Yamaha Japan, the creators of the motors, creates the owner's and service manuals. The website information is by Yamaha US, who is just the US distributor. One way or the other, something is not correct. Given that all of the owner's manuals are saying 5500 (many of them) I don't know which to believe. Don't have access to service manuals from where I am now.

By redline I am referring to what the engine maker says is the not to exceed engine RPM. A rev limiter is a device used to protect a motor when the driver is not doing his job properly. It kicks in above the redline value is of course.

I would agree that a 1000 or 1500 RPM range is silly. Yamaha themselves recommend to prop to get to the top of the range. Many boaters unfortunately are propped way to low and wonder why the motor performs like a dog.