Power loss at high rpm Mercury 15hp 1990

[Dutchdude]

Hi,Just bought this outboard, runs fine the first time, but the second time it started to run rough at full throttle. At Low and midrange speed the engine runs fine.- Bought new sparkplugs, no result, - Mercury Dealer cleaned the carb. en placed a new fuelpump, no resul, - Checked the ignition timming at low and high speed, ok, - Bought the repair manual and checked the Low speed charge coil (3150 Ohm) and high speed charge coil (133 Ohm). The high speed charge coil should be between 200-250 Ohm.And now?? buy a new charge coil?? Give me some advise please..Greatings,Dutchdudep.s. Sorry for the language, i'm really Dutch

[roscoe]

You are not Dutch here.You are a boater!!!Sorry for what language??I am no expert on ignitions, but you seem to have found the problem. I hope a new high speed coil solves the problem. Also, it helps to curse a bit when working on an engine.