TinBoats.net
The original aluminum boat site!
Forums
New posts
Search forums
Blog
What's new
New posts
New media
New media comments
Latest activity
Media
New media
New comments
Search media
Members
Current visitors
Log in
Register
What's new
Search
Search
Search titles only
By:
New posts
Search forums
Menu
Log in
Register
Install the app
Install
Forums
Boats
Motors
1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Reply to thread
Help Support TinBoats.net:
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
Message
<blockquote data-quote="thill" data-source="post: 373697" data-attributes="member: 4972"><p>You might want to go up a size on the main jet to compensate and take advantage of the extra air you are giving it. Also, to avoid a lean condition.</p><p></p><p>When I ran my 1994 Evinrude 25 with the hood off, she gained a lot of pep, and I gained a couple of MPH at WOT. But when I slowed down, she didn't want to idle. I wondered about running lean, so I popped the choke a couple of times, and that kept her going. After a while she would idle without issue. When I ran at WOT again, AGAIN, she wouldn't idle afterward without hitting the enrichener. But after a while, she would idle perfectly.</p><p></p><p>I believe that without the cowl, I was running lean at WOT, which "dried out" the crankcase. Pushing the key fixed it until the fuel distributed back into the crankcase. Obviously, running lean is NOT something I want to do for long!</p><p></p><p>So I had a choice: Open up some more air inlets and go up a jet size, or leave the cowl on. I left it alone. </p><p></p><p>But if you make more air intake and go up a jet size, I bet you will have a beast on your hands!</p><p></p><p>-TH</p></blockquote><p></p>
[QUOTE="thill, post: 373697, member: 4972"] You might want to go up a size on the main jet to compensate and take advantage of the extra air you are giving it. Also, to avoid a lean condition. When I ran my 1994 Evinrude 25 with the hood off, she gained a lot of pep, and I gained a couple of MPH at WOT. But when I slowed down, she didn't want to idle. I wondered about running lean, so I popped the choke a couple of times, and that kept her going. After a while she would idle without issue. When I ran at WOT again, AGAIN, she wouldn't idle afterward without hitting the enrichener. But after a while, she would idle perfectly. I believe that without the cowl, I was running lean at WOT, which "dried out" the crankcase. Pushing the key fixed it until the fuel distributed back into the crankcase. Obviously, running lean is NOT something I want to do for long! So I had a choice: Open up some more air inlets and go up a jet size, or leave the cowl on. I left it alone. But if you make more air intake and go up a jet size, I bet you will have a beast on your hands! -TH [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
Top