Quote Originally Posted by R19 View Post
That is correct...vent holes in a prop creates air bubbles which in turn allows the prop to gain RPMs faster. A prop will have resistance aginst the water. Water with air bubbles does not have as much resistance therefore it spins up to max RPM faster,increasing hole shot time. To many holes in a prop and it will blow out/spin out/loose bite in the water.
Correct. My 200 had all large size in it, and it was blowing out - swapped over to medium and it does great now.

My father-in-law's boat doesn't have any plugs in his prop, so it's not uncommon to pop them all out.