I have been searching through the threads to help troubleshoot my '99 225HP OX66. The symptoms are it runs at idle(600-700 rpms) then it "coughs" and stalls. Also, at speed it seems to lack power and you can hear it is running rough. So far we have:
replaced the RACOR filter separator element...
I have a 1999 225 OX66 twin engine boat. My starboard tach gage is not totally fubar, but a half inch section of the lower right corner of the display is black (not the one pictured). The only tachometer I can find, either on the Yamaha web site or even Ebay does not match my existing tachs. Is...
I just bought a boat with twin 1999 OX66 225Hp Saltwater Series engines with 700 hours on them. Engines run strong, turn up to 5k RPMs, fuel consumption seems about right for boat weight @ 1.5MPG(20GPH)(total) 3500rpms. The exhaust smokes at start up which seems normal for these engines, and it...
Left the dock at 10AM. Air temp was about 30 Deg F. During initial run out engine ran normal but Tachometer display was jumping from 35 to 45+/-. The display would show 35, then instantly jump to 40, 45, then back to 35. Engine did not act or sound as any speed changes were actually occuring...
