high all just wondering how long should we keep the spark plugs hourwise when should we replace them and where is the best place pricewise to buy them Ive had my plane over two years and the center electrode on a few of them look oblong somewhat. but I might add that they look great with regards to color and no crud. Syd maybe that's why #3 was slow (worn plugs) I have about 250n hourson them since I've owned 564.
thanx dennis 99564
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