engine problem yamaha jet boat 2013 limited s

[brian nguyen]

I have the yamaha jet boat 2013 limited s. When I load the boat into the water and I start the engine, they run very well. After I ride the boat for 3 or 4 hours and I turn off the engine a few minutes and I start it again they don't run. And I start it over and over 10 times then it runs. When I turn off the engine it is very hard to start again. Please help me if you know the problem.

 

[Speedling]

I have the yamaha jet boat 2013 limited s. When I load the boat into the water and I start the engine, they run very well. After I ride the boat for 3 or 4 hours and I turn off the engine a few minutes and I start it again they don't run. And I start it over and over 10 times then it runs. When I turn off the engine it is very hard to start again. Please help me if you know the problem.

Pull a couple spark plugs when it does this and take a picture.
Also, Both engines or one?
Look for loose connections and/or battery corrosion.
Could just need spark plugs. Ever change them?
Could be lack of fuel or fuel injector stuck open.
The spark plug should indicate rich or lean once running.

 

[brian nguyen]

I have bought a new spark plug from yamaha and and replaced the air filter and the fuel pump, but i still have the problem with one engine. Do you think the sensor is bad?

 

[Cobra Jet Steering LLC]

Try moving the throttle lever a bit, just slightly forward and backward sounds like the throttle positioning sensor is not set correctly.

 

[Gym]

If they both crank but don't start it could be the lanyard switch. Try holding the plunger up as high as possible when trying to start.

 

[swatski]

I have the yamaha jet boat 2013 limited s. When I load the boat into the water and I start the engine, they run very well. After I ride the boat for 3 or 4 hours and I turn off the engine a few minutes and I start it again they don't run. And I start it over and over 10 times then it runs. When I turn off the engine it is very hard to start again. Please help me if you know the problem.

I can't say I know exactly why the following steps seem to work... but they do! (help with hard re-starts):

1. idle/high idle for a few seconds to cool the engines before turning them off; check water temp coming out of the "pissers" - should be hot/warm but not scalding hot; if in doubt - idle a bit longer;
   
2. position the throttle levers/binnacles exactly in "neutral" position before turning the engines off;
3. turn the blower ON (this is the most important point) while sitting/taking a break w/engines OFF (if the engines are still hot);
   
4. if that still does not work but you can get one engine to start - see the next point:
   
5. shift as much weight as you can into the bow area (fore), start riding/getting up on plane using the one engine that works; while turning hard into that side start the second engine (this last maneuver seems to help ventilate the engine compartment while, at the same time, lifting the stern/swim deck out of the water may relieve any extra back pressure in the exhaust)

EDIT: re:5. the throttle lever for the second engine must be in neutral when restarting it on plane; keep in mind overdoing this maneuver may risk water ingress through the exhaust.
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