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  1. #1

    Is there a a document that shows engine RPM with impeller RPM for each Yamaha model?

    I'm just doing a little research/learning. I'm interested in understanding the engine RPM relative to the impeller RPM for given Yamaha models. Is that info documented anywhere?


  2. #2
    Site Admin Green Hulk's Avatar
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    Engine RPM and impeller RPM is the same.... it's a direct drive.

  3. #3
    Quote Originally Posted by Green Hulk View Post
    Engine RPM and impeller RPM is the same.... it's a direct drive.
    ok, thanks, for some reason I thought there was some gearing that changed the direct drive in some models.

  4. #4
    Site Admin Green Hulk's Avatar
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    Quote Originally Posted by god2dman View Post
    Quote Originally Posted by Green Hulk View Post
    Engine RPM and impeller RPM is the same.... it's a direct drive.
    ok, thanks, for some reason I thought there was some gearing that changed the direct drive in some models.
    Older model, yes. Direct drive in all 1800cc 4 strokes

  5. #5
    Quote Originally Posted by Green Hulk View Post
    Quote Originally Posted by god2dman View Post
    Quote Originally Posted by Green Hulk View Post
    Engine RPM and impeller RPM is the same.... it's a direct drive.
    ok, thanks, for some reason I thought there was some gearing that changed the direct drive in some models.
    Older model, yes. Direct drive in all 1800cc 4 strokes
    ok, including the 1100cc 4 strokes like the vx110 and fxho? I had read that those 2 models have a "reduction gear", but I may be wrong.
    Last edited by god2dman; 10-10-2013 at 05:34 PM.

  6. #6
    Site Admin Green Hulk's Avatar
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    The Yamaha MR-1 engines have a reduction gear with a drive that is at a 1.47:1 ratio

    Hope that helps!

  7. #7
    It does help because i was confused why direct drive models are faster yet lower rpm than models with reduction gears.
    I will do some reading on the reduction gears.

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