Changed out intake manifold and carb. Bigger throat on carb and bigger intake on manifold. From my understanding the powerHeads are the same.
Now you have me wondering what would happen if I advanced the timing 🤔
Otherwise it runs great. Probably could afford to burn off more fuel. I have...
Been learning a thing or two about old outboards last couple years. Decided to build a little race engine for a small racing boat. Anyone out there have specs on porting and polishing intake and exhaust ports ? Am I pissing in the wind ?
I already have done a intake manifold and carburetor...
https://forums.iboats.com/threads/80s-johnson-evinrude-25hp-to-30-35hp-conversion-with-pics.516146/
You may find some answers here. I did the conversion on my 86 20hp last year. Man does she have some spunk!!
I have a 1986 20hp Johnson manual start and I'm in the process of locating a electric start motor for parts to convert to electric start. What year and horse power motors will work. I did a little research but would like to confirm with you guys. Y'all had helped me a while back with some firing...
Ok, I bought a 1986 Johnson 20hp. Completely changed out all the fuel lines, pump and etc. Pulled down carb and noticed the main jet was crushed from previous owner. Couldn't find a 20hp carb to put back on so I was forced to put a 25hp carb. After doing exstinsive research and asking a few...
