i just bought a 50hp mariner with remote steer it is a 1988, i want to convert it to a tiller is this hard to do and were do i get the tiller arm and all the stuff i will need to do this , the motor has tilt and trim and has electric start, i need to put this on my 18ft smokercraft, also i need to change out the impeller the guy i bought it from could only drop the lower unit about 3/4 of an inch then it stoped is there a bolt up top or do i need to undo the linkage or something, he just bought the boat and this motor last week for 2500 and got frustrated when he couldnt drop the lower unit to change the impeller , he says the motor runs awesome but it was peeing speraticly, the motor sat for 5 months before he bought , anyway i paid $150 for the whole thing and he guarentied me it will run , so i need to find out why or were there is a bolt to drop the L U and were can i get a tiller unit for this motor, also i was told this is a yamaha power head is this true, thxs for any help guys i really need your expertise right now .. tom