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Originally Posted by romansek
I mesured the grooves where the O-rings go on and found that the stem grooves are not same size. The proper O-ring for the larger groove it is 11x7x2mm and for the smaller groove it is 10x6x2mm. I bought the O-rings in a hardware store.
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when i replaced the o-rings (from the originals
) i noticed that the top one was a little larger. however 2 same size new o-rings fit ok in both places...
i noticed a marked improvement of startup oil pressure and by cleaning the pin holes in the shaft the hot idle oil pressure reading is much higher than it was.
