9.5 HP Johnson/Evinrude design changes?

[WEH]

I understand that the 1964 9.5's used a different motor mount or vibration control than the 1965 to 1973 model years. Were there any other "improvements" made to the 9.5HP model line from 1964 to 1973?<br /><br />I also have heard these motors are prone to exhaust leaks, noted from my previous topic on these motors. Practically, how much of a problem is this? There seem to be a lot of them around, still running.<br /><br />Are there any other particular flaws in these models?<br /><br />Thanks,

 

[WEH]

Re: 9.5 HP Johnson/Evinrude design changes?

Bump-it-up, Bump-it-up, Bump-it-up, up, up.<br /><br />I guess what I am really asking is, is there any particular model year(s) of the OMC 9.5HP that would be more desireable because of something in the design?<br /><br />Thanks,

 

[slow_boat]

Re: 9.5 HP Johnson/Evinrude design changes?

The lower unit changed I think around '68 to a somewhat more durable design with less drag. My '69 has been great & the exhaust gasket never failed. I did develop an exhaust leak after cracking the clamshell housing by drifting into a submerged rock (anchor pulled loose & hit the rock drifting stern first; was anchored from bow in current) I have heard others complain about the lower units being weak in earlier year models.

 

[seahorse5]

Re: 9.5 HP Johnson/Evinrude design changes?

The first model, 1964, used springs for vibration dampeners. Later years ran smoother because they used brake pad material to act as dampener.

 

[Frank Martin]

Re: 9.5 HP Johnson/Evinrude design changes?

also had a caeburator upgrade

 

[WEH]

Re: 9.5 HP Johnson/Evinrude design changes?

Was the carburator upgraded at the 1964/1965 model year change or later?<br /><br />I'm thinking these were pretty decent outboards, a ten year production run and a lot of survivors after 30 to 40 years must account for something.<br /><br />Anything else ? ? ? ? ?

 

[WEH]

Re: 9.5 HP Johnson/Evinrude design changes?

About the carburator upgrade, what was changed?<br /><br />Thanks,

 

[slow_boat]

Re: 9.5 HP Johnson/Evinrude design changes?

Reed plate was moved and linkage from adjustmnet needle to cowling was modified...not aware of any others.