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Ridgid generator with Yamaha engine question!

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  • Ridgid generator with Yamaha engine question!

    Im looking to purchase a RD6800 Yamaha powered generator with a blown engine really cheap, but im not sure what size or type of crank engine will fit. Im looking to fit a Honda GX-390 but im unsure what version will fit. I know the Ridgid RD7000 already comes with a HOnda gx 390 already so it will fit if the crank is correct. Please help soon! thanks

  • #2
    Re: Ridgid generator with Yamaha engine question!

    I do not have your specific answer, but I will tell you this. Whatever motor you buy, the end of the crank needs to match the crank coming out of the blown motor you already have. Essentially you will need to identify the end, and find somebody who knows their stuff to match you up a motor. Chances are very good you will spend over $400 on a motor to repower your genny. What are the chances that the genny will not work once repowered? I would be inclined to spend a few extra dollars to buy a unit that already works.

    Another alternative is buy any ol motor and have a machinist turn the crank output shaft to match the existing one.

    What kind of damage was done to the blown motor? Is there a window on the side of the block? worn out, burned valve, etc? It might be easier to rebuild it if the internals did not self destruct.

    I am guessing on your model number, but here is some sample pricing to fix the motor you have


    1 7CT-E1400-70-00 CRANKSHAFT ASSY $171.37
    2 7CT-E1631-10-A0 PISTON (STD) $39.95
    7RH-11635-00-00 PISTON (0.25MM O/S) | AP $35.68
    7CT-E1636-00-00 PISTON (0.50MM O/S) AP | AP $37.73
    3 7RH-11603-00-00 PISTON RING SET (STD) $17.79
    7RH-11604-00-00 PISTON RING SET (0.25MM O/S) | AP $17.79
    7RH-11605-00-00 PISTON RING SET (0.50MM O/S) | AP $17.79
    4 7CT-E1633-00-00 PIN, PISTON $5.80
    5 93450-21833-00 CIRCLIP
    6 7CT-E1650-00-00 CONNECTING ROD ASSY $34.59
    7 7CT-E1654-00-00 BOLT, CONNECTING ROD $2.97
    8 7CT-E1454-00-00 WEIGHT 1 $51.35
    Last edited by masterbeavis; 09-22-2011, 11:40 PM.
    We don't have preventative maintenance around here, we have CRISIS MANAGEMENT!

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    • #3
      Re: Ridgid generator with Yamaha engine question!

      smallenginewarehouse.com is a good place to look, they have images and links to specs so that you can get exact dimensions on things like crank diameter, how far the crank sticks out past the block, if the crank is stepped, etc.

      Not sure which Yamaha engine comes on that generator but if you can take measurements right off the engine you can probably match it up with a Honda. The only other issue would be mounting the Honda (and making sure it clears the zero gravity frame), but like you said if the GX390 comes on the 7000W model, it will probably fit on any provided the crank is correct.

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      • #4
        Re: Ridgid generator with Yamaha engine question!

        Originally posted by superz View Post
        Im looking to purchase a RD6800 Yamaha powered generator with a blown engine really cheap...
        Depends on what you mean by "blown".
        The MZ360 Yamaha on the RD6800 has an issue with governor failure causing the engine to either throw a rod -or- seize the crank & rod.
        IF you were the ORIGINAL owner of the generator, Yamaha would pay to replace the engine. But since you're not, they won't.

        If it's a seized engine, the engine can be repaired pretty easily... and far cheaper than buying a new Honda.

        "Doc"
        "HONK if you've never seen a gun fired from a moving Harley"

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        • #5
          Re: Ridgid generator with Yamaha engine question!

          Originally posted by superz View Post
          Im looking to purchase a RD6800 Yamaha powered generator with a blown engine really cheap, but im not sure what size or type of crank engine will fit. Im looking to fit a Honda GX-390 but im unsure what version will fit. I know the Ridgid RD7000 already comes with a HOnda gx 390 already so it will fit if the crank is correct. Please help soon! thanks
          I am not sure about the answer to your dilemma, but there is a small engine site and discussion group out there that might have some observations. Go to:

          Small Engine Technical Forum • Index page

          Howard Ferstler

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          • #6
            Re: Ridgid generator with Yamaha engine question!

            Doc,
            What is the specific issue with the governor failure on the Yamaha MZ360 engines? Is the issue on all production runs? Is it during a certain month and year? How can the issue be prevented? What are the possible warning signs, if any?
            Thanks,
            Dave

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            • #7
              Re: Ridgid generator with Yamaha engine question!

              Originally posted by dave42ny View Post
              Doc,
              What is the specific issue with the governor failure on the Yamaha MZ360 engines? Is the issue on all production runs? Is it during a certain month and year? How can the issue be prevented? What are the possible warning signs, if any?
              Thanks,
              Dave
              The governor gear (part # 7CT-E1970-00) blows apart... the plastic gear comes apart sending the flyweights to the bottom of the crankcase. Thus, the engine overspeeds and either seizes or breaks (throws) the connecting rod.

              Some MZ360 engines serial number began with 7CTB-4XXXXXX. Never seen one of those fail. The ones that fail begin with 7CTB-60XXXXX. But then again, the replacement engines ALSO begin with 7CTB-60XXXXX, so there's no way to determine which ones are going to fail.

              There are no warning signs. One minute it's running fine. The next minute it's overspeeding. Then it quits.
              "HONK if you've never seen a gun fired from a moving Harley"

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              • #8
                Re: Ridgid generator with Yamaha engine question!

                Doc,
                Thank you very much for the explanation. Good stuff.
                Dave

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