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I got a brand new vanguard 26 hp mower 4 years ago and is not running good on top end, I clean the carburetor twice thru the years and seems like it runs better with the choke at 25 %, does anybody knows why or have similar experience, thanks.

Ch740 kohler runs fine at idle but when I go full throtle I get some explosions and the engine does Rev up the way it should, I check spark plugs an seems like is running rich I also install a new carb, didn't fix the problem, I check completion and I got 145 on each cylinder, I got good spark...