ehlien
Regular Contributor
I have a 454 Merc IO in a 28&#
I have a 454 Merc IO in a 28' Baja with a 21 pitch SS Mirage prop. Last year I had the stern drive redone. As this year has gone on I have found the engine RPM starting to rev higher particulary when I start the day off or it fluctuates significantly as I drive. At this point I have to get to 4500 RPM to do the speed I used to at 3500 and no way it will stay under 5000 at 3/4 throttle. Sometimes after I have been out running a while it seems to stabalize back down. The boat is stored in the water usually with the drive in at least the partially up trailer position. So what's up with this? What are the rpobably causes and solutions??
Thanks!!
I have a 454 Merc IO in a 28' Baja with a 21 pitch SS Mirage prop. Last year I had the stern drive redone. As this year has gone on I have found the engine RPM starting to rev higher particulary when I start the day off or it fluctuates significantly as I drive. At this point I have to get to 4500 RPM to do the speed I used to at 3500 and no way it will stay under 5000 at 3/4 throttle. Sometimes after I have been out running a while it seems to stabalize back down. The boat is stored in the water usually with the drive in at least the partially up trailer position. So what's up with this? What are the rpobably causes and solutions??
Thanks!!