Re: Need your advise for BF90
stemar, I have a suzi 4-stroke, 140 hp. After 50 hrs. ( at least what I was told to do) was change upper and lower unit fluids. As well, I was supposed to " re-torque" the blocks main bolts. I would certainly check with your dealer. You need to do EXACTLY what they tell you so that you don't run into warranty problems cheers!