Quote:
if you're smart,you're gonna replace the engine with a complete new engine...
manifolds and risers-5yrs max-flushing has no bearing here.
trust me,the advice i gave is the best...
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I agree with everything here but the issue of flushing. Flushing your engine can save your from early failure, but failure will still come. Regular motor flushing can extend manifold life to 7 years IF it is done without the motor ever cooling with salt water still in the manifolds.
the problem is many/most people shut the motor down while drifting or anchored, or fail to flush after use until they trailer the boat home, allowing the motor to cool and then reheat with high quantities of sodium still in the manifold.
Replace the motor if you plan on keeping the boat for more than two more years. Replace the motor with a closed cooling system and heat exchanger, and STILL change the manifolds and risers every 5-7 years.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury