2018 FSH 210 Speed Impeller Questions

[YamFSH210]

I have a 18 FSH 210 and looking for more top speed . With 4 -5 pole on board getting 32-34 MPH . I am at Sea Level , RPMs are at max 8000 . Boat has wonderful take off . Just did the old , plugs and all maintenance items 2 weeks ago.

Question is with the RPM's at Max ,should I be looking to change the impellers to a different pitch . 34 MPH on smooth water seems like I should be getting more like 38 or 40 or more.

Any Ideas

 

[YamFSH210]

Anybody ?

 

[anmut]

Have you looked for any causes of drag on the hull? Everything clean? I agree, you should be high 30's at least.

 

[YamFSH210]

Bottom is Clean , Sealed with Rejex and then waxed. Looked at pump intake seal and all look good. Everyone is great except for the slow top end. Since I am up against the REV Limit , the only conclusion I can make is the Impeller Pitch. I have no problem holding it there and never seems to drag the RPM down

 

[anmut]

How about your pump alignments - too toed in maybe?

 

[YamFSH210]

I have looked at alignment and best I can tell they are very close.

 

[Dixie Highway]

You should be in the low 40's at sea level, smoothish water and no wind with 3-4 average adults on board. I hit 44-45 (these are speedo numbers so take that with a grain of salt) with 2 adults and 2 kids, that's at around 600' elevation on fresh water. Any chance this boat has high elevation impellers?

 

[YamFSH210]

I do not know for sure , purchased new from Jacksonville Florida Dealer , So I would Assume ( We know what Assume Means ) that it does not . I only have 35 hours on it , so I have not done any impeller or wear ring mods or replacements . It has never been torn apart .

 

[anmut]

I have looked at alignment and best I can tell they are very close.

Look up the cobra fins installation instructions - he's got directions on how to make sure your jets are aligned. Basically put the steering wheel dead center, run a straight edge across the inlets and look for gaps if I remember right.

 

[YamFSH210]

Using a 4 foot Level across the Rear of the Jet Nozzles and it is perfect . No Gap on any of the four points where the nozzle touches the Level.

 

[Dixie Highway]

Anyone know if there's a way to tell the regular impellers apart from the high elevation ones?

 

[YamFSH210]

And here is pictures As best i can of the Impellers

 

[YamFSH210]

And that is Yamaha Factory Silicone , Messy and Everywhere .

 

[Dixie Highway]

Maybe someone more experienced in impellers than I am will be able to tell. I just know they have 2, one is for high elevation. That one is equivalent to putting numerically larger gears in your rear end, making acceleration better but limiting top speed. They help account for the thinner air.

 

[anmut]

I see you have thrust vectors? Are those properly installed and not creating any drag?

 

[YamFSH210]

No Drag , Even before I installed speed was about the same. Last trip out I looked at them to make sure and at Speed they are riding up out of Thrust.

 

[anmut]

So if your RPMs are maxed, your drag is fine, your impellers are clean and in good shape, you’re at sea level, and your jets are aligned... damn dude I’m out of ideas. You’re not running with the bimini deployed? Invisible anchor? One engine off? ?

 

[YamFSH210]

I’m stumped , thats why the only thing I can come up With is impeller pitch change , should I have existing impeller re-pitched or go to a new impeller.
don’t seem to be a fan of Solas as I hear horror stories about them self destructing . I’m stuck as what to do ?

 

[Dixie Highway]

@swatski has deal with impellers some.

 

[Dixie Highway]

@jcyamaharider I think has dealt with impellers also