Outdrive gear ratio.

[Retiredsdier]

Good afternoon everyone.
I'm Randy and I'm having issues finding the gear ratio on my upper unit. S/n 0D646810. That is off the transom gimbal unit. I would appreciate any assistance any one can give.

 

[Fun Times]

Is your stern drive a bravo 1 or 2?

What engine size/model?

 

[Retiredsdier]

Is your stern drive a bravo 1 or 2?

What engine size/model?

It's a 7.4 mercruiser with a bravo one drive. 1991 Rinker Fiesta V 260

 

[Fun Times]

Probably going to be 1:50:1 but with the size of the boat it could be the 1:65:1.



@Yegboats , Any chances of taking a peek to see if the transom 0D646810 is registered to a stern drive?

 

[Retiredsdier]

The boat is 28ft with a 7.4 weight is 5100 lb. Thank you for all your help.

 

[Retiredsdier]

Is your stern drive a bravo 1 or 2?

What engine size/model?

It's a bravo 1.

 

[04fxdwgi25]

My last boat was a Chapparal 2550 SX Sport w/ 7.4 and B1 drive and same weight as yours at around 5080 lbs dry and an 82 gal gas tank.. That was a 1.5:1 ratio and would run 53 mph all day long. I'll see if I can find the old prop size spec it had.

 

[Yegboats]

Probably going to be 1:50:1 but with the size of the boat it could be the 1:65:1.
View attachment 401835


@Yegboats , Any chances of taking a peek to see if the transom 0D646810 is registered to a stern drive?

Unfortunately the transom serial # isn't registred. Any chance you have the engine drive, or engine serial numbers?
TRN: 0D646810 6020000ES MERCRUISER BRAVO I/II

 

[Retiredsdier]

Unfortunately the transom serial # isn't registred. Any chance you have the engine drive, or engine serial numbers?
TRN: 0D646810 6020000ES MERCRUISER BRAVO I/II

Not at the moment. The boat is at a storage facility and I'm going there to do some work on it Sunday.