Checked gear lube and no metal. Didn't do this with aluminum prop. I know the ss is much heavier. Could the extra counterbalance be the problem?
Answers: I've seen this issue come up frequent times on many boats we whip care of. It turns out, that near the weight of the propeller that the motor have to spin, and with the tempermental vacant of a two-stroke outboard, that the shaft that runs from the bottom of the motor itself down to the propshaft is actually mortal jerked vertebrae and forth against the splines on the bottom of the motor (coupler) and usually, if your propeller is installed correctly, that is the travel case. I personally own never seen a stainless propeller on any motor smaller than a four stroke 90 HP Mercury or Yamaha, and most of the time Yamaha's come beside aluminum propellers. The factories for adjectives marine engine manufacturer send out different props for respectively motor, and not most of the time, but ALL the time, they send the engine/drive packages beside the prop that performs the best within all situations. My suggestion to you would be to put an aluminum prop back on this motor and ring up it good. If it be a 225 HP Mercury w/ that rumble I wouldn't worry something like it because a stainless prop comes with that motor from the factory (and the 225's, up to that time the OptiMax did rumble). Happy boating!
I had an outboard years ago and the propeller shaft be slightly bent. You could not tell anything be wrong with a neutral aluminum prop. But, with a substantial stainless steel it vibrated existing bad. I not sure this your problem, but, that what it be on mine. With the engine in dull, not running you can spin the prop by hand and may see it wobble. If you hold Earmuffs and a garden hose you can start it and put it in gear and see. Sometimes it may be easier to see spinning by mitt.
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