Well i bought boat used 96 290fs stratos with evenrude 225 and i have noticed that there i a peice of wire with 6 jets on it and is wraped to a hose on the carb. The boat was new in WV and went to Harrisburg PA and now i have it in the mountins of PA. Im 3rd owner. But last fall I had it out 1 time before I put it away and the boat ran great. Wot was 52mph and 6200 rpms. All winter i was looking to buy different prop and i got it out this spring and cant get more than 47mph and 4800 rpms . If i trim more i only rev to 5100 rpms. Changed power pack. But not much change. Did some oms tests cant seem to find the problem.