342 Performance Issue

buggyjdavbuggyjdav Member Posts: 134 ✭✭
342 with twin Merc 350 Horizons. Having trouble getting on plane. Did a 3 hour run in the Ocean yesterday, good conditions, 1-2 ft waves. At wide open throttle I can't get above 4000 rpm or more than 25 mph. Seems that going above 75% throttle does nothing, no more rpm nor speed. Could it be that the throttle cables need adjusted/replaced? Trim tabs working, no bottom growth. 

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