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  1. R

    MEP-831A Fuel Pump

    In the past I have purchased new crankshafts and rod bearings from Yanmar and rebuilt these motors, and yes they are very simple to work on. The last one I ran across the customer choose not to rebuild it since it was out of his budget range.
  2. R

    MEP-831A Fuel Pump

    Hopefully you can get the compression gage rigged up to work for you, as that is a crucial piece of the puzzle. IF you happen to find compression low, something I have seen on several different single cylinder Yanmar model MEP's is that a spun rod bearing could be the cause of a compression...
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