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  1. #1
    Click avatar for tech links/info K447's Avatar
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    Arrow GP1800 SVHO impeller and wear ring erosion

    My 2017 GP1800 SVHO has a Solas impeller, tweaked and refurbished by Impros a couple of years ago.

    While investigating a reduction in top speed (GPS measured) of about 7 mph (approx) and slippage during hard acceleration I discovered that both the Solas impeller and the OEM stock wear ring are suffering from metal erosion. I presume this is caused by jet pump cavitation.

    I was aware of localized pitting on the wear ring near the impeller leading edges, in early 2021.



    At the time I did not want to bother chasing Yamaha for warranty and did not observe a negative performance effect. So I reinstalled the jet pump and rode it last summer and this. Maybe 100 running hours, give or take.

    Fast forward to now. All three impeller blades are rounded and eroded along the outer edges. Blade clearances are 17 to 20 thou. Clearly not helping with either acceleration or top speed.





    I am curious if other members with Solas impellers have noticed similar patterns of blade surface corrosion as shown on two of the blades here. It looks to me like a problem with the alloy metallurgy or perhaps stress within the blade metal.





    These are fresh water operated, except for two winter seasons (2019, 2020) when I used them in Florida gulf salt water. Salt-away and rinsed after every salty ride, including the jet pump.
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  2. #2
    xkon's Avatar
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    I have probably 3 years, 60 hours, on my Solas impeller for a 2019 gp1800r. Not showing any signs of corrosion like that. Don't have any experience with a wear ring being worn, but 7+ mph seems to be a significant drop. I would think if the impeller was chipped or jagged from something being stuck in there that would be more likely? Is the loss of top speed consistent or intermittent?


  3. #3
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by xkon View Post
    … Is the loss of top speed consistent or intermittent?
    Speed is currently consistent from one ride to the next. Fresh spark plugs installed recently, when I noticed the speed was surging at times. No more surge since then.

    I did change the intake grate about a year ago. Changed from Worx to Riva intake grate. Did not measure/record the before/after speed delta. More interested in the hookup and handling effects.

    I normally do not run the higher performance Riva tunes, most of the time we use the Low Octane version of Riva Stage 1 Plus Tune.

    When the machine was much younger I ran the ‘normal’ Stage 1+ and also the AGR Stage 1+ versions and noted the speed range achieved. Top speeds would of course vary with air and water temps and fuel load, etc. Right now daytime air temps are trending cooler so I was not expecting to see the much lower (relative to several years ago) top speeds with the AGR tune.

    I reloaded the AGR tune recently just for fun and was mildly surprised that the top speed was noticeably less than I recall from the past. Also noticed the prop spinning more during aggressive acceleration.

    Until I get the jet pump into shape I will not know whether or how much other factors may also be affecting top speed.

  4. #4
    thats what mine looked like after 380 hrs but it was a stock impeller. if you ride in salt water, like i do, you get Cl2 stress cracking no matter what you do. also any high flow area will get worn by the solids in the fluid- i have had sstl thremowells that have cuts in them from normal fluid erosion

  5. #5
    Rook87's Avatar
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    Same same. All these parts advertised for jetskis are pure junk. I'm over it.. bad props from solas, crappy riva ride plates, riva junk charger shafts, deans customer service. We're buying crappy eBay Honda civic quality parts that are being advertised as Lamborghini quality products. My new 22 ski got a Racelab tune and simple Macsboost filter, I'm good. Not touching anything more with riva, deans, worx etc that's put in front of our faces daily. Too much...? Lol
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  6. #6
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by Rook87 View Post
    Same same. All these parts advertised for jetskis are pure junk. I'm over it.. bad props from solas, crappy riva ride plates, riva junk charger shafts, deans customer service. We're buying crappy eBay Honda civic quality parts that are being advertised as Lamborghini quality products. My new 22 ski got a Racelab tune and simple Macsboost filter, I'm good. Not touching anything more with riva, deans, worx etc that's put in front of our faces daily. Too much...? Lol

    Derek, Thats not caused by any of the "junk" parts you installed. That's cavitation burn is caused from an air leak at the transom plate. Yamaha doesn't do the best job at sealing them. Until you re seal your transom plate you will continue to have this issue. The info on these threads will help you

    http://greenhulk.net/forums/showthre...hlight=transom

    http://greenhulk.net/forums/showthre...hlight=transom

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  8. #7
    Click avatar for tech links/info K447's Avatar
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    To keep this thread intact, I am now on the hunt for two replacement SVHO 160mm wear rings (since we have two 2017 GP1800 with similar impeller and wear ring damage).
    Note: Yamaha OEM original wear ring has two part numbers?
    6ET-51312-10-00 or 6ET-51312-00-00 ?
    Not sure yet what the difference is

    Apparently for about the same cost, new, I can purchase either the OEM 2020+ Yamaha 160mm stator with replaceable pressed in stainless steel wear ring liner, OR the Riva 100% stainless steel wear ring. Or Worx?

    Prices are remarkably similar for the two options.

    Looking for input on which option to choose, and info on discounted sources.


    The Riva stainless steel replacement wear ring section (RY33-160-YV) is a straight-up bolt in replacement which would re-use the existing 2017 Yamaha SVHO stator assembly (with 400 hours on each of our GP1800 now).







    The Solas YVS-HS-160 also comes up as a replacement stator option.
    Unclear whether one or another would be a better choiuce.



    The 2020+ Yamaha 160mm option is an entire new stator 'kit' which includes SS wear ring liner, cast aluminum (I believe) stator with wear ring housing (might be Yamaha part number 99999-04523-00 ?), plus new o-rings, new driveshaft seals and shaft bearings. I would end up with a rebuilt-like-new jet pump, which seems appealing.
    (2020 SVHO Pump Kit)





    In every case the impellers will be going to Impros for refurbishment over the winter.
    Come springtime I want to have good impellers and new or like-new wear rings, everything ready to install when I pull the skis from winter storage.
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  9. #8
    Click avatar for tech links/info K447's Avatar
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    SVHO jet pumps are removed from the GP1800 hulls.
    Skis will be off to winter storage within the week



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