If you would like I can pick it up and test it out for the next few weekends of the coast of SC. I would hate to know a THT Brother is endangering himself, friends, family on an untested boat.
Second thought I may need to test it out through August to make SURE everything is ok
I love those Seaswirls and I am sure you will enjoy it, good luck.
Not sure if is just Yamaha's but some motors have a port that you can download motor information on rpms and etc.