I bought racing Honda gx 200 from mudskipper and then put it on 15’ Grumman sport boat with swamp runner small kit, and it is slow! Maxes at 10 mph. This boat only weighs 130 pounds, I feel like something is wrong. I have tried many props, just about every size. 6.25, 6.5,, 6.5 weedless, 7 (bogged down), 9 (bogged down)

I do not know what is wrong. Not sure how to test rpm or anything but it just seems like it should boogie. I have seen YouTube videos of the same set up really moving. Any pointers would be appreciated. I’m willing to buy new motor if this is a dud. It seriously seems like it is.

Any pointers to maybe test, diagnose, improve, or trash the process. Please I am all ears. I have to generally travel 5+ miles to get to my hot zones for hunting or fishing.

Thank you