Hello everyone. Thanks for taking the time to read this. Any direction would be greatly appreciated. I just purchased and placed a 1993?40hp Nissan 2stroke on my Lowe’s stinger(17.5’). With muffs motor runs amazing. Compression is 121/120, the prop is in working order no spinning, both spark plugs spark on ignition. Motor looks clean and out of water runs great. Went fishing yesterday and my top end max was 7.5mpj. Any ideas?