Power loss at high rpm Mercury 15hp 1990

Dutchdude · #1 August 19th, 2004, 02:16 PM

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,

Dutchdude

p.s. Sorry for the language, i'm really Dutch

roscoe · #2 August 19th, 2004, 10:39 PM

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.