yamaha 25 gear ratio

[dirtrider1975]

I have a 99 model yamaha 25 3 cylinder,i was hoping someone could tell me what the gear ratio is.

 

[robert graham]

Re: yamaha 25 gear ratio

My book says 13:27(2.08), but I'm not sure exactly what that means.

 

[dirtrider1975]

Re: yamaha 25 gear ratio

thanks for the reply,2.08 is the gear ratio.is your motor a 2 or 3 cylinder?

 

[robert graham]

Re: yamaha 25 gear ratio

My motor is a 1999, 90HP, 2 stroke, premix, carbed. My gear ratio is 2.0 and guess that means the prop turns about half the RPM's of the motor or twice the RPM's of the motor? It must be half, otherwise the prop would be turning 11,000RPM's at WOT. I really should know this but never thought much about it.

 

[robert graham]

Re: yamaha 25 gear ratio

And it's a 3 cylinder...

 

[robert graham]

Re: yamaha 25 gear ratio

The book says your 25HP is a 2 cylinder...

 

[dirtrider1975]

Re: yamaha 25 gear ratio

im looking for the gear ratio on a 1999 3 cylinder yamaha 25h.p. outboard