1988 Yamaha 90hp conks out

timo14

Cadet
Joined
Jun 30, 2005
Messages
11
Hey Guys,<br /><br />My friends yamaha sputters to a halt after running WOT for almost exactly 15 minutes, every time we go out. It runs like a top prior to that, starts right up, accelerates smoothly to WOT. After it conks out, if we pump the ball, it is fine. It almost seems like the breather is clogged and creating a vacuum in the tank, but we pulled the line and it is clean.<br /><br />Any ideas?<br /><br />Thanks in advance.
 

Ray Neudecker

Lieutenant Commander
Joined
May 25, 2004
Messages
1,656
Re: 1988 Yamaha 90hp conks out

A stuck check ball in the tank anti siphon valve will cause this.
 

timo14

Cadet
Joined
Jun 30, 2005
Messages
11
Re: 1988 Yamaha 90hp conks out

Ray,<br />Is this the check valve in the ball itself. So replacing the prime ball could be the solution?<br /><br />Thanks for the guidance
 
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