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="Johny25" data-source="post: 317643" data-attributes="member: 7791"><p>Well if you want just a little more power you can just bore out the backside of the 20hp carburetor to make it into a 25hp. This is the only difference between the 20 and 25 if memory serves me correct on the 90' models. If you want the extra ten HP then intake and carb will be needed. The 20 had a restricted small hole on the backside of the carb where it attaches to the intake manifold, bore it out to match intake hole size and you got you a 25hp. Don't get any metal into the crank case though so remove carb to do this and clean well.</p></blockquote><p></p>
[QUOTE="Johny25, post: 317643, member: 7791"] Well if you want just a little more power you can just bore out the backside of the 20hp carburetor to make it into a 25hp. This is the only difference between the 20 and 25 if memory serves me correct on the 90' models. If you want the extra ten HP then intake and carb will be needed. The 20 had a restricted small hole on the backside of the carb where it attaches to the intake manifold, bore it out to match intake hole size and you got you a 25hp. Don't get any metal into the crank case though so remove carb to do this and clean well. [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
1980's Johnson/Evinrude 20/25hp conversion to 30hp with pics
Top