2000 mariah z212
 

when i first got my mariah i to had a vibration problem only on take off and it planed out really good and got up to speed fine what i found out was that the prop was not all the way tight i tightened it up and she has been fine and no more vibration. I suggest taking your prop off and repositioning it back on the shaft and tighting it all the way on with the locking washer to make sure it doesnt come off or get loose.:wink_thumbup: