I'm stumped?
 

Well, here it is.....
I have a friend that has a Centurion Dominator (25 footer/ 454 mag with a alpha 1ss). The last time he took it out he noticed that for some reason it was revving 400 rpm higher than it ever has before. So, instead of the 4500 rpm he would top out at. Now it was topping out at 4900 rpm at w.o.t. Any thoughts on what would cause this to happen considering he has not changed a thing or modified anything on the boat.

Fixx
 

cooler weather will do it..

Yep, and it would be faster too.


did speed change?

+1 on the cooler air. colder air - more dense, carries more fuel... more varooooommmm!

When mine was doing that egine coupler went out about 30 mins. later she was slipping big time

Prop hub slip.

alittle off topic but shouldn't a 454 mag spin higher than 4500 anyway?

wacky tach !

Thanks for the replies guys! I will have to ask my buddy if he noticed anything when this was happening. I will relay all the info to my friend and if he gives me anymore info, I'll post it!