Power head swap

[imported_Billnoy]

I have a 1994 Evinrude 80 jet<br />(115hp),Model#E115JKLERS with a bad cylinder.With the advise of members of this board ( Smart people),I bought a 1983 115hp(prop motor)mod#E115TLCTE that runs great.The idea is to swap the powerheads.I have a dilema however. The jet has a tuned exhaust cover (bubble back)and the earlier motor does'nt(flat back).It was suggested that I put the tuned cover on the early powerhead,(to make more hp.) which makes sense,but should I swap carbs also to maintain the proper mixture, or will it make a difference ?? <br /> Thanks for the help<br /> Bill

 

[Dhadley]

Re: Power head swap

About the only time that makes a difference is when the motor is over 6000 rpm. Your jet probably isn't so it may not make a lot of difference. You can swap the exhaust covers easily. Dont even bother with the deflectors inside, leave them out. <br /><br />Even if you don't swap the exhaust you can swap the carbs just to see for yourself what happens but, again, on a jet it probably wont make a lot of difference. If one set of carbs is bigger it'll obviously burn a bit more fuel.

 

[Dhadley]

Re: Power head swap

Oh, one more thing to look at -- the 94 has the driveshaft O ring in the crank. The 83 has it on the driveshaft. If you don't swap cranks you'll have no driveshaft O ring. No biggie, just pull the lower and grease the splines each year with a good waterproof grease.