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  1. #1
    davenoscott's Avatar
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    Mikuni oil pump assembly

    Here's the oil pump exploded. I'll try to explain the reassembly.Click image for larger version. 

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  2. #2
    davenoscott's Avatar
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    The main drive pin is held in by the tiny pin It's put through the tiny hole under the bottom plate. You can see the hole on the pic below. The piston gear goes on through bottom then the throttle pin slides in. The small U shaped piece goes in through bottom and locks the throttle pin in place. Put the bottom plate on. The spring goes into top then the piston slides in on top of it. Turn the piston until it bottoms out. Put top plate on and you are done. Very simple design but I failed to visualize where everything went during disassembly and the U shaped piece through me off. I also kept putting the spring between the top plate and the piston.

  3. #3
    davenoscott's Avatar
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    Click image for larger version. 

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  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Thanks for posting the photos.

    I am still having trouble visualizing how the pump actually pumps the oil.

    Is the oil flow positive displacement for each oil outlet? If one outlet is left unconnected do all the other oil pump outlets also lose oil pressure?

  5. #5
    davenoscott's Avatar
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    I would say no they both don't lose pressure. The piston moves up and down and also turns in the cylinder. The holes on the sides of the piston is what directs oil to the outputs.

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