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thump
my 150 1988 mercury runs great except sometimes when im running inreverse you her a thump or low bang from the engine its been doing this for about 3 years so when im backing up i take it slow cause then it dont do it dont know what it could be
changed my lower unit oil and no metal in ther i was thinking if it could be something with the trim since going in reverse it would be trying to pull the motor up just a thought
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love to fish 
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