I have a mercury 800 80hp engine, that previously was in major need of a little TLC as it sat for about 7 years, I have only owned this boat for a short time and after replacing numerous parts... impeller, spark plugs, trigger, stator, fuel lines (now with inline filter), fuel pump kit, carbys rebuilt/blown out with compressor and new gaskets, new engine harness, starting solenoid, battery, fuel line from tank to engine and fresh fuel. It now runs, idles and I guess sort of drivable, no timing has been adjusted only the fuel mixture. Initially the idle mixture was set the about 1.5 to 2 turns ccw from seating position, after first test driving it did operated at WOT and hummed along as it should, I was rather impressed but after 20 mins use it started to run rough, when throttle applied it stammers to WOT, but can be driven at certain positions on throttle but not as smooth operating as the first 20 mins of operation. If I apply the choke button obviously dumping more fuel in it, it does improve power. I have readjusted the fuel mixture to make it run rich.
It starts, idles and goes into gear and drives, again it did operate at WOT and planed but something is a miss.
Where should I start fault finding.. carbys? ignition? or could this now be internal? so far I have not delved to much into the mechanical side just parts that were in need of replacing due to visible deterioration.
It starts, idles and goes into gear and drives, again it did operate at WOT and planed but something is a miss.
Where should I start fault finding.. carbys? ignition? or could this now be internal? so far I have not delved to much into the mechanical side just parts that were in need of replacing due to visible deterioration.
