John Deere 650 injector pump


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John Deere 650 injector pump

Alan Hello,I am in the process of troubleshooting a problem with the injector pump on my fathers 650 lawn tractor.It is a 2-cyl yanmar and I was checking the injector pump timimg per the manual and the timing marks are not lining up like they should.Engine rotates CW and the mark on the block is at about 2 o'clock position but the fuel stops dripping about 12 o'clock on the crank pointer from the #1 TDC on compresson stroke.The book says to shim the pump up to correct but I want to know why it is that far off. Anyone familiar with this little engine?
thanks
Alan



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