1955 johnson 25hp idle

41steve

Recruit
Joined
Sep 13, 2009
Messages
1
I have a 1955 Johnson 25hp. Once I start it up it will idle just fine for a little bit. After that the motor will rev up like the throttle was opened all the way up. Then the motor will just die on me. I rebuilt the carb after I started having this problem, and I do have a good pressure tank. I thought that by rebuilding the carb would fix it but it hasnt. The float is set right also. I just cant seem to figure it out. Do you have any advise for me. I would greatly appreciate it. Thanks Steve
 

jbjennings

Captain
Joined
Jul 18, 2007
Messages
3,903
Re: 1955 johnson 25hp idle

It sure sounds like it's running out of fuel. I would check for a stopped up sintered fuel filter. Take out the fuel filter and see if that has any effect, make sure your float is set so that the bowl is staying full. Check for vacuum leaks around the intake manifold or fuel line connections.
Good luck,
JBJ
 
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