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8 hp johnson WOT slow?

Any ideas on a 1991 8hp johnson---runs smooth at idle--only does 8 mph on a 12 light alum boat....doesn't seem to rev to its highest rpm.

Remer and Sherry Collins
August 2011
Check the pitch of the prop, this is like gearing, if to steep you will not reach max revs, if to shallow will over rev.

pedrodeltorre
October 2011

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