How do late 80's Johnnyrude 40, 50, 60 differ?

[fishnfiend]

A single gasket set for my '88 Evinrude 40 fits "40,45,48,50,55,60HP, 1979 UP." This seems to indicate that the powerhead is the same for all.<br /><br />Is there an easy way to milk a few more horses out of my 40? Maybe carbs from a 50?<br /><br />If powerhead is the same, how do they differ?<br /><br />What say the pros?

 

[DJ]

Re: How do late 80's Johnnyrude 40, 50, 60 differ?

The differences are many.<br /><br />1. Carburetion.<br /><br />2. Port timing.<br /><br />3. Peak RPM.<br /><br />There may be others such as: pistons, compression ratios, etc.