I've played with all those settings, props, fuel,etc. My other tunnel is running in the high 40's, and if you guessed its a K&B your right.
Everyone tells me this motor should go faster but after playing with it for a half of last summer its not running very good, high 30's.
My goal this year is to break the big 50 mph this year. I have been playing with tunnels for some 15 years and I still ask questions.
I see Mark (HTB) has a new pipe out and I'm just wondering what is the difference between new and old pipe. Got to get this boat running. Got a new Octura Y-537 that I'm going to try. Always trying new things for the quest of speed.