Yamaha bout running rough… please help!

[dlazic1979bg]

Over sudden engine lost power- i can get up to 6000 rpms but no power .i can go maximum 10mph. I thought something got stuck, i chrck the plug but there is nothing there. Its seams motor is running rough. Check the video… boat is 2016 yamaha sx192.

 

[Neutron]

Check your supercharger clutch makr sure it doesn't spin both ways. Check all hoses from your supercharger to the throttle body.
Change your spark plugs. If its missing it could be a faulty coil or two

 

[dlazic1979bg]

How to check for super charger clutch? I am brand new owner . Thank you!

 

[dlazic1979bg]

I notice one black hose on the right just seating there..

 

[Neutron]

I notice one black hose on the right just seating there..

Not your issue. Thats normal. To check the SC clutch you remove the rubber boot that goes from the air box to the supercharger. Then with the engine off you try to spin the intake fins of the supercharger, it she spin free only one way and not at all the other

 

[dlazic1979bg]

Clutch is only moving into one direction. I just got the boat and previous owner told me that he did service on a boat end of the last season ( he only had a few hours since the service) so I didn’t do much this season. I took this boat four times out for a few hours.

 

[Hot2Go]

There has to be something in your impeller, check again. Do you have a ton of vibration when you throttle up?

 

[dlazic1979bg]

Yes, I do. I opened the plug and took a little grass out—very little. A few grass pieces were wrapped around the shaft. I connected the water hose to flush it, and I noticed water coming from the back but not from the pisser on the side. I only ran an engine with a water hose hookup for about three minutes. I was afraid to run it for longer. Where else can I look? Thank you, guys.

 

[Hot2Go]

Vibration means you definitely had stuff stuck in there. Water not coming from the pisser (AKA pilot hole) is fine when running on the hose! My old boat never had water coming out any of them on the hose.. On the hose is fine to run it because the cooling route is different from when you’re on the water. Make sure it’s engine on water on them water off and engine off for the sequence on the hose, always. If it’s on the trailer look underneath with a flashlight through the intake at the impeller, if you can’t see anything it’s fairly easy to pull the entire pump as well to be for sure nothing is in there. If nothing is in there then you’re most likely good to drop it in the water and go again!!

 

[dlazic1979bg]

Thank you so much for your advice! When you say to take the pump off, do you think to take those four big screws off? I am a new boat owner, so I am learning all this!

 

[dlazic1979bg]

Impeller looks clean, no debris. Do you guys think I should change sparkplug and coils?

 

[Hot2Go]

Shouldn’t be a spark plug or coil issue. Search on YouTube how to remove your jet boat pump, I’m sure you can find a video!

 

[dlazic1979bg]

Thank you!

 

[FSH 210 Sport]

Impeller looks clean, no debris. Do you guys think I should change sparkplug and coils?

Did you look up from the bottom through the intake grates?

 

[Neutron]

What has me puzzled is it will only go to 6k rpms, but if thats as far as you tried to go and backed off then definitely check your pump. But if thats as fast as it would go you might have an engine related concern

 

[dlazic1979bg]

Yes- everything looks clean. After reconnecting the booth for supercharger I feel engine is working calmer - more normal. I checked pump as well and i didn't see any debris as well. I will put in water today and see what happens.

 

[dlazic1979bg]

Update: I used the boat for a few hours. No problems whatsoever. I feel the boot that connects the supercharger might have been loose, or the little grass I had in the pump might have done it. Do you guys have favorite place for spark plugs, coils or oil. Thank all of you for all the help and education. I appreciate your kindness so much!!

 

[Hot2Go]

Jet boat pilot for parts is always reliable and customer service is top notch. What they don’t have I always shop on Partzilla or Yamaha sports plaza.