performancems

so after replacing the power valves both motors seemed to run a tiny little better, then moved onto timing and I think i'm finally good to go. One motor was at only 26 degrees while other was at 30. Both are now at 33 and throttle response is perfect, they run better than they ever have since i've owned it. Sea trial tomorrow, should hopefully be good to go. Before with the hesitation from both and crappy idle out of one i was only able to see 4500 and 4600 rpm and 65mph, and there were still some notches left in the throttle sticks. I'm really hoping I can get into the 70's. Everything I've seen says max rpm should be around 5200-5500 rpm, correct?

SB

iTrader: (1)

When setting total timing with Mercruiser modules, absolutely make sure that you find out where the module ends advancing timing. A lot of people assume they'll stop at some rpm but don't check.

I ran into one (525SC) that advanced up to like 4200rpm.

Previous mechanic (marine mechanic) mind you didn't. so, guess what, yup, about 10 degrees too much.

You do this by reving motor until you see it stop advance, and then rev it higher to make sure.

So yeh, I didn't like it, but I went to 4500rpm on those 525SC's.

Black Baja

iTrader: (2)

You may want to pull your distributors and inspect the gears. Worn gears lead to retarded timing. Eventually when you run out of gear the rotor will not turn at that point it's time to get towed in.

CDShack

5200-5500 correct