Lost 1000 RPM's Merc. 160

wildways1976

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Jul 25, 2009
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Im not quite sure why or how but I have concluded I cannot find the issue.... I have a 1968 Mercruiser 160 and rebuilt the motor last year..... I had it out one day at 4500 rpm for WOT and the next day I got 3500 WOT.... I have checked and replaced all fuel related items, checked compression (105-110) across the board...... Ignition is up to snuff nothing is binding.. Any ideas???? anyone?
 

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