Good deal! Got plenty more and will hook you up with the rigs when ready.
4 strokes (especially yamahas) are made to burn at a certain temperature, ie keeping a consistant grade of fuel.....87, 89 ect ect. When you add seafoam (especially shock your system), your motor will burn "hotter" and damage seals, sensors and the thermostat ( $75 part, quick easy fix).
Once or twice may not hurt it much, but constant use will create potential issues.
Ill be probably putting up my fish sled up for sale here very soon and upgrading. Keep an eye out!
I am pretty serious about selling it. Havent cleaned it up yet (be a few weeks probably). Message me if ya wish for details prior. My boat is one of those skiffs that are very hard to find around.