I have a 2000 Merc Optimax 225 EFI saltwater on my Whaler and late last season it started doing this strange surging at low speed. Flat out, it is just a fast as ever with no hesitations at all. I have to travel through a couple of miles of no-wake and that's when it is really noticeable. It...
The other day while checking out another older model Merc I noticed the port for the fresh water wash down had a plug installed. Since my motor didn't have any plug installed I asked a Merc tech and he told me it wasn't necessary because of a brass check valve. Can anyone else confirm this for...
