84 35 HP MERCURY MOTOR HAD NO IDLE. CHANGED STATOR, POWERPACK, AND CARB. NOW THE FLYWHEEL SOMETIMES HITS AND IS BREAKING THE MAGNETS WHERE THE LOW IDLE TIME IS. WHAT CAN WE DO TO FIX THIS PROBLEM? IT IS IN THE SHOP AND THE REPAIRMAN CONTACTED ANOTHER SHOP THAT HAD THE SAME PROBLEM. THEY PUT A NEW FLYWHEEL ON AND IN SIX MONTHS IT CRACKED AGAIN. ANY IDEAS?