Sea Ray

Ditto to above. A compression test only shows that it has compression. It's everything else that makes it go fast....need lot more info

Propeller specs can also make a difference. Back in the day on my dad's Glastron in order to pull out two big slalom skiers we put on a different prop. That took away from the top end speed.

Thank you for the feedback. It is helpful. When I noticed the speed I was using the boats speedometer and not GPS. I will check the GPS next time we take it out. As for the weight, the tank was about half full, two passengers and minimal gear. The trim was adjusted and according to the speedometer it helped and we gained a few more mph,37 tops. I am not sure about the prop, it is a three blade and has a couple of really small nicks. I did not note the WOT RPMs but will do so next trip.

There were a couple of things the dealer fixed before we took delivery, new battery, new distributor, tune up. They also changed a cutout (?) switch, that is connected to the throttle. I just recently changed the oil and gear oil in the stern drive.
I have a kit to replace the impeller later on.

You're on the right track. As to the prop, a couple of nicks won't make a big difference in speed. What you want to determine is if the prop has the best pitch for your boat. Also, stainless steel versus aluminum can make a difference. If you find you still aren't satisfied once you've checked GPS speed I would suggest you take your findings (RPMs at WOT, prop size and pitch, engine and outdrive specs ) to a good prop shop.and see what they advise. Some shops will even loan you props to try out on your boat. Good luck.

how about the spark plugs, when was last time they were changed? bad plugs will deff drop top end.

Find out if you have the correct prop to attain that speed.

I have three props for different needs. My 5 blade is noticibly slower.

Interesting with new boaters, speed is everything. Who needs speed. You don't when pulling people, you're on the lake for "fun"