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14 SX192 vibration.

YAMMY

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Yamaha
Year
2014
Boat Model
SX
Boat Length
19
I have a vibration from the stern as soon as I go over 2100 rpm.
It's not crazy but it's very noticeable and loud enough to be hard to talk over.
Kinda sounds like something heavy sitting in the bottom of the boat. ( There isn't )
I'm new to jet boats so I haven't gotten the nuances down yet.
Also there is a shutter in the throttle stick.
And the throttle won't stay in one place unless I'm putting.

Thanks guys.
 

Cobra Jet Steering LLC

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Reverse hood is too low and obstructing the water flow from the nozzle ADJUST it up out of the way of the water first tighten the large white nut where the cable exits the hull then look at the bottom of the reverse bucket in relation to the top of the nozzle opening , the bucket needs to be just clear of the opening.
 

Gym

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23
I have a vibration from the stern as soon as I go over 2100 rpm.
It's not crazy but it's very noticeable and loud enough to be hard to talk over.
Kinda sounds like something heavy sitting in the bottom of the boat. ( There isn't )
I'm new to jet boats so I haven't gotten the nuances down yet.
Also there is a shutter in the throttle stick.
And the throttle won't stay in one place unless I'm putting.

Thanks guys.
Sounds like you may have something stuck in your jet pump. You can pull the cleanout plug and feel around for something foreign or when you have it on the trailer you can give it a better look. You may have lost some sealant around your intake grate causing cavitation.
 

Cobra Jet Steering LLC

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The symptoms are reverse bucket, pump issue he would have cavitation and the controls vibrating and the sound gave that one away
 

d_coyne1984

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I seem to remember the boats resonant frequency being somewhere in that RPM range. Unfortunately it was about the perfect speed for slow cruises.
 

swatski

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I seem to remember the boats resonant frequency being somewhere in that RPM range. Unfortunately it was about the perfect speed for slow cruises.
Yep, there is that, many people have experienced the low RPM (but above idle) rumble in those singles (190/192). However, that would not effect the throttle or make it move, I don't think... i think CObra is on to something!

--
 

YAMMY

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I seem to remember the boats resonant frequency being somewhere in that RPM range. Unfortunately it was about the perfect speed for slow cruises.
Dam... That was the exact answer I didn't want to here.
Anyone know of a way to get rid of it? Some type of counter weight?

Also has anyone sound proofed their engine compartment?
 

d_coyne1984

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Yep, there is that, many people have experienced the low RPM (but above idle) rumble in those singles (190/192). However, that would not effect the throttle or make it move, I don't think... i think CObra is on to something!

--
I missed the part about the throttle. I did experience that too on occasion. Adjusting the bucket height seemed to eliminate almost all of it for me.
 

swatski

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In
I missed the part about the throttle. I did experience that too on occasion. Adjusting the bucket height seemed to eliminate almost all of it for me.
In my case most any rumble was eliminated by switching to wear rings with removable delrin inserts, it really was one of very few things that could quiet a 190, somewhat.
Bucket adjustments notwithstanding.

 

Sebastian

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I missed the part about the throttle. I did experience that too on occasion. Adjusting the bucket height seemed to eliminate almost all of it for me.
Adjust above the spec? Meaning bigger gap in neutral position than in the manual?

I do have the same issue and it's sometimes a pain to adjust for cruising.
For me, pretty exactly 2200 works, but gets noisy above.
I noticed, it gets better when I rev up and lower the rpm to 2200.
 

YAMMY

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In

In my case most any rumble was eliminated by switching to wear rings with removable delrin inserts, it really was one of very few things that could quiet a 190, somewhat.
Bucket adjustments notwithstanding.

Could you give me a link to what your talking about?
Like I said I'm.new to jet boats,. When I talked to a parts place they told me that there are no wear rings and that I would have to replace the entire housing. 580$ part.
 

YAMMY

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SX
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I seem to remember the boats resonant frequency being somewhere in that RPM range. Unfortunately it was about the perfect speed for slow cruises.
That would be terrible.
I wonder if I can eliminate that vibration at all.
It is at the perfect putting speed.
 

swatski

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Could you give me a link to what your talking about?
Like I said I'm.new to jet boats,. When I talked to a parts place they told me that there are no wear rings and that I would have to replace the entire housing. 580$ part.
Just realized you have the 2019 boat!
Those are newly redesigned pumps, with no separate wear ring, and I doubt an after market part exists.

I'm surprised you have this problem, actually, those new pumps are supposed to have a different liner, should be much smoother.

--
 

Cobra Jet Steering LLC

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Did you make sure the reverse bucket is up out of the way of the water exiting the nozzle ???? see how the buckets are above the top of the nozzle opening in this picture if your reverse is lower than the ones in the picture it will vibrate the controls and cable the cable will vibrate and resonate through the hull
 

Attachments

YAMMY

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I have not gotten to doing this yet.
The boat is currently in the water, but it needs a fill up so I may pull it out, fill it up and raise the bucket.
I know the throttle control vibration is from the bucket being low, I hope it has something to do with the vibration.
Also the throttle stick is a bit annoying, it's stiff yet it won't stay where I put it.
So cruising down the lake I have to hold the throttle for it to keep a constant speed.
It's stiff enough that I cant really eas into the throttle. It always jumps a bit.
 

mwalker4

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Location
Delaware County, Ohio
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Yamaha
Year
2019
Boat Model
SX
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19
Yep, there is that, many people have experienced the low RPM (but above idle) rumble in those singles (190/192). However, that would not effect the throttle or make it move, I don't think... i think CObra is on to something!

--
I definitely have a rumble in no wake mode 2 which is about 2200 rpm, but it goes away in no wake 3 at 2400.
 

YAMMY

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Messages
7
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Boat Make
Yamaha
Year
2014
Boat Model
SX
Boat Length
19
I definitely have a rumble in no wake mode 2 which is about 2200 rpm, but it goes away in no wake 3 at 2400.
Yeah that's about the right spot.
I find these jet boats so loud, I think I'm going to try and a sound dampening/ vibration dampening material to reduce the noise. I just have to find the right one.
 
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