Re: hey merc techs? 1997 mariner mag lll 2.5 150 hp up to 200 hp
your post is unclear if Im reading it correctly you want to make your mariner 150 into a 200.If this is correct the only way is to sell it & buy a 200.However if you want a few more gee gees out of your 150.Put a set of Boyesen reeds in & keep it well tuned & get the right prop for your needs.Props can make alot of difference.I gained several Km/h by changing from merc aluminium to hustler alumiunm in the same size.Hope this helps
