Quote:
Originally Posted by doradohunter
. . . The 4BT is a great motor, just a little shakey. They vibrate alot at idle.
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Yea, an I-4 motor is not naturally balanced like an I-6 or a V-8, so they all do that if they don't have balance shafts, especially if over 2.0L displacement. The 140 MerCruiser was also rough at idle.