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
Yamaha F 9.9 vs T9.9 or Mercury 9.9 vs 9.9 Big Foot
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="Pappy" data-source="post: 370820" data-attributes="member: 3278"><p>On the Johnson/Evinrude product the exhaust ports never were different on that family of engines, from 1974 until the end of the two stroke production run.</p><p>On the 1974 engine you had to change the carburetor (9.9 to 15hp) for the biggest change then the exhaust pipe to the exhaust tuner. Those were the two main changes. The third one makes a small difference and that is the reed block shim. The exhaust pipe/tuner change went away with the last version of engines as did the reed shim. </p><p></p><p>The best change for the OP here would be to modify his engine and leave the 9.9 sticker on the side of the cowling. For the heavier load leave the 9.9hp prop on the engine.</p></blockquote><p></p>
[QUOTE="Pappy, post: 370820, member: 3278"] On the Johnson/Evinrude product the exhaust ports never were different on that family of engines, from 1974 until the end of the two stroke production run. On the 1974 engine you had to change the carburetor (9.9 to 15hp) for the biggest change then the exhaust pipe to the exhaust tuner. Those were the two main changes. The third one makes a small difference and that is the reed block shim. The exhaust pipe/tuner change went away with the last version of engines as did the reed shim. The best change for the OP here would be to modify his engine and leave the 9.9 sticker on the side of the cowling. For the heavier load leave the 9.9hp prop on the engine. [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
Yamaha F 9.9 vs T9.9 or Mercury 9.9 vs 9.9 Big Foot
Top