1975 Johnson 25hp compatibility

[NathanLGND]

Hello all. I have searched and searched and can not find a solid answer and was hoping you all would be able to help. I recently bought a boat (my first), and it came with a 1975 Johnson 25hp 25R75B. On my maiden voyage, it started to slip out of gear. If I feathered the throttle JUST right I could get it to stay and get up to speed. Long story short I found a 1969 Johnson 25hp parts motor for sale for $100. Will the lower unit from the ‘69 bolt directly to my ‘75? I’ve looked up part numbers and it seems as if the housing #’s are the same, and the driveshaft #’s are the same, but the clutch dog #’s are not the same. I even called a local outboard repair shop and he wasn’t 100% sure. Please advise, and TIA!

 

[racerone]

It bolts right on.

 

[F_R]

The complete unit will swap.. Internal parts may differ..

 

[NathanLGND]

Thank you for the clarification! I was driving myself crazy trying to figure it out without buying it and trying it. Much appreciated!

 

[saltchuckmatt]

Are you sure it's not the prop?

 

[tphoyt]

Agreed you should check to see if your prop is slipping before pulling the trigger on a lower.
You can mark the prop and the hub and take her for a spin if your marks are no longer aligned you know you have a spun hub.

 

[racerone]

A complete parts motor for $100 is a bargain.

 

[tphoyt]

Agreed again. I missed that part and it would be worth pulling the trigger.