98' 150 Ficht w/100-200rpm hesitation at WOT

[fichtfart]

I have a 98' 150Ficht, updates, and all that- no real history of major problems/issues, (except only 120 hrs on it)- lately- at WOT, (5300rpm), I'll occassionaly get a 100-200 RPM loss, (via Dash tac), and they last 1/2 to 1 second, and vary in frequency- in a 2 min WOt run- I'll get anywhere feom 0- 10 of em. Stop/ start okay- then they'll be back at WOT right away- or it'll take a few min.'s, or...not for a long time. No horns, warning lights- does not run rough when the drop occures- just picks up again and sounds fine. Lower RPS'm not affected- trim adj- does not make it worse/better- new Bulb, fresh gas and plugs look good.....<br />any ideas?<br />Fuel pump? injector?<br />Have an extended warranty that I'd like to cash in on if needed- but it expires soon.....<br /><br />wj

 

[seahorse5]

Re: 98' 150 Ficht w/100-200rpm hesitation at WOT

Hook up a fuel pressure gauge to the fuel rail fitting and make sure it stays above 20 psi. If not, troubleshoot the fuel supply from the boat before condeming the fuel pumps.<br /><br />Some of those older <br />motors had a timing surge for some reason, and retarding the spark 2 degrees helped a lot, yet did not slow the motor down.