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
EVINRUDE 9.9 - Doesn't run great all the time - '76
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="jonboatboy" data-source="post: 353983" data-attributes="member: 13307"><p>I had a similar problem with my 50hp Johnson. Jim chapel has a great idea. Next time it starts acting funny you can pull one plug wire off at a time. If you pull one off and the motor doesn't die then that cylinder is dead. Also I've herd of the diaphragm in the fuel pumps will start to break down when they get hot and cause those kinda problems. I'm no expert but I know how you feel and it drives you nuts! It's definitely a fuel or fire problem if compression is good. Just do a process of elimination. Start with a compression test and you can pull your fuel line from the carb. and pull it. It should spit a bit of fuel out and do the thing where you pull the plug wire off too. Also check your fuel lines and the bulb as I've herd that the ethanol fuel is eating them up. I only run 100% gas in my boat now. I put 6 gallons of ethanol gas in it and that's when I started having trouble.</p></blockquote><p></p>
[QUOTE="jonboatboy, post: 353983, member: 13307"] I had a similar problem with my 50hp Johnson. Jim chapel has a great idea. Next time it starts acting funny you can pull one plug wire off at a time. If you pull one off and the motor doesn't die then that cylinder is dead. Also I've herd of the diaphragm in the fuel pumps will start to break down when they get hot and cause those kinda problems. I'm no expert but I know how you feel and it drives you nuts! It's definitely a fuel or fire problem if compression is good. Just do a process of elimination. Start with a compression test and you can pull your fuel line from the carb. and pull it. It should spit a bit of fuel out and do the thing where you pull the plug wire off too. Also check your fuel lines and the bulb as I've herd that the ethanol fuel is eating them up. I only run 100% gas in my boat now. I put 6 gallons of ethanol gas in it and that's when I started having trouble. [/QUOTE]
Verification
Post reply
Forums
Boats
Motors
EVINRUDE 9.9 - Doesn't run great all the time - '76
Top