Originally Posted by LURCHER
My local outboard man has told me i must replace the whole gearset ..
You can do what you like, it's your engine!
As Paul says, it is good practice to change the whole gear set but that is likely to cost you an arm and a leg. Plus, if you can't do it yourself, you'll need to pay someone to set it up correctly and that will cost. Also, I betcha there aren't too many folk who get the setting up spot on.
It could cost more that the motor's worth.
So it's your call.