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  1. #1

    2017 GPR 1800 stage 3 idles rough and skips to 17 mph

    Any ideas on why my 2017 GPR 1800 Stage 3 idles rough and skips when given the throttle even moderately from idle to 17 mph but runs fine after that. I just replaced the impeller and housing and shaft after 49 hours because of wear and damage from cavitation and a stuck and damaged impeller. Still it does as it did before the tune up, new gas, spark plugs, and pump work. I would appreciate any suggestions as to what should be checked. The shop says the injectors and ecu are fine.

  2. #2
    Click avatar for tech links/info K447's Avatar
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    Who did the Stage 3 tune?

    Have you asked them about the problem?

  3. #3
    Thanks for the response. Riva installed all the upgrades. The ski is one of the limited edition skis by Riva. The local Yamaha dealer is the party that I took it when I started having this problem. I requested they consult Riva. They indicated they would.

  4. #4
    Quote Originally Posted by H Rocket View Post
    Thanks for the response. Riva installed all the upgrades. The ski is one of the limited edition skis by Riva. The local Yamaha dealer is the party that I took it when I started having this problem. I requested they consult Riva. They indicated they would.
    I've ridden this ski also and it does appear to miss or skip as in running rough with fluctuating RPM levels at 6 to 13 MPH but clears up when acceleration occurs for higher speeds.

  5. #5
    Click avatar for tech links/info K447's Avatar
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    Quote Originally Posted by H Rocket View Post
    ... Riva installed all the upgrades. The ski is one of the limited edition skis by Riva. ...
    So the entire watercraft is effectively a Riva product.

    Riva tune with Riva installed hardware modifications, Riva branding, the entire package is Riva.

    That suggests Riva would support it, not as something with some Riva parts on it, but as a product, the entire watercraft.

  6. #6
    Not exactly sure what you're experiencing but it could be supercharger surge. My Tial BOV had an 8lb spring and shuddered between 10-20ish mph until I replaced it with a lighter 2lb spring. I believe Riva uses 11lb springs with their BOV's.
    Last edited by jetdawg701; 11-26-2019 at 12:25 AM.

  7. #7
    Lake Lion
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    Intercooler condensation.

  8. #8
    Quote Originally Posted by jetdawg701 View Post
    Not exactly sure what you're experiencing but it could be supercharger surge. My Tial BOV had an 8lb spring and shuddered between 10-20ish mph until I replaced it with a lighter 2lb spring. I believe Riva uses 11lb springs with their BOV's.
    Nice thinking! Cant for the life of me figure out why the sell it with that monster of a spring in there!

  9. #9
    Quote Originally Posted by mwhc View Post
    Nice thinking! Cant for the life of me figure out why the sell it with that monster of a spring in there!
    i have the monster spring (stock spring) in my riva gen3 I/C BOV and no problems with it running a 17lb wheel

  10. #10
    Quote Originally Posted by yellow jacket View Post
    i have the monster spring (stock spring) in my riva gen3 I/C BOV and no problems with it running a 17lb wheel
    We didnt either with the 17. Try a 19 or 20 and report back


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