break-in my STS .28 today follow the instruction manuel. I had went through 6X2minute heat cycle and run 8 buggy tanks of fuel, I lean up my LSN for 1/2 turn and 1 turn on HSN, still feel rich on the top end(not much speed increasement between 1/3 and full throtal, my working temp on pavement is less then 150F, using 20% o'donnal fual with O.S hot plug . is my engine still too rich?