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    Low power under load at 1/2 or more throttle

    1980 175HP OB having trouble making power and running smoothly under load. Did the usual preliminary tests. Compression is at 90 PSI on all six cylinders. Strong blue spark even at large gaps on the spark tester. Then rebuilt the carbs, adjusted the floats, sync'ed and linked the carbs and...
  2. S

    Low top end power/ Low RPM

    Hello all, I'm new to iboats and i'm hoping I can get the right advise here. I have a 1980 175 Merc o/b mounted to a 17' Invader. Last year I got the boat running after 10 years of sitting. It ran 3200 RPM at WOT and planed quikly because the low end was strong. Also, at 3200 RPM the boat...
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