I've got a 24 hp twin. It has about 200hrs on it. Bought it new and never been adjusted. On a tractor. Basic problem is it has a backfire through the muffler. It was hard to start too at times too. I opened the valve covers to check them. I did the set up, TDC and 1/4 past it. On both I could not get a 005 in. The 004 goes in but you have to really push it. According to the book, they should be set at 004-006. My motor is 445667. The rocker arms are tight with the 004. I noticed on videos around even with 004 you get a very slight movement. Should I see a very slight movement? Should I go up to 005?
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