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merc 150 4-stroke drops 400 rpm

larr

New member
2016 merc 150 4 stroke
4-5 seconds after smooth initial acceleration to approx 4000 rpms engine suddenly drops 400 rpms lower then the initial setting

from idle set to 4000 drops to 3600 after 5 seconds
from idle set to 4500 drops to 4100 after 5 seconds

can stiil obtain WOT

never looses 400 rpm again until after return to idle

then repeats loss after initial high rpm setting

i would appreciate any suggestions or ideas
thank you
larry
 
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