Lower unit gear ratios

[jslu]

Merc 35 HP, 1987, SN 177575

I know for a fact that the lower end gear ratio for this motor is 2:1 by turning the flywheel clockwise and observing the prop rotation. It is dead on at 2:1.

I am considering a replacement lower unit form a 1989 or 1990 60 HP Merc and the gear ratio for this seems to be slightly different, like 2:1.1, making the same observations as above.

Can anyone confirm this?

It seems to me that this replacement would work considering maybe a prop pitch change to keep the recommemded max RPM in the proper range.

Thanks,

John

 

[Faztbullet]

Re: Lower unit gear ratios

The 35hp is a 2:1 ratio and the 60hp is a 1:83:1, it will be hard to prop for the difference....