you are asking a question that needs a visual analysis , as you said you ground the carbon of the valves. well how do we know what you have done. you could have damaged the valve seat. carbon is either soaked off or can use a wire wheel. no grinders allowed! also is the valve lash set? if the valves are at zero lash for example they might be just not quite seating. you can read the valve seats to see if the problem lies there or not. there is lots a person can see with the eye instead of guessing at different things. and also many time there is so little info given on a problem thats why it involves so much guess work. everybody says it could be this it could be that but it all a guess. when you look at things visually the experienced can see problems that the not so experienced can not see, or have no idea what to look for.
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Today's Featured Article - Product Review: Black Tire Paint - by Staff. I have been fortunate in that two of my tractors have had rear tires that were in great shape when I bought the tractor. My model "H" even had the old style fronts with plenty of tread. My "L" fronts were mismatched Sears Guardsman snow tires, which I promptly tossed. Well, although these tires were in good shape as far as tread was concerned, they looked real sad. All were flat, but new tubes fixed that. In addition to years and years of scuffing and fading, they had paint splattered on
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