technically this is a boat question, so you may want a mod to move it accordingly
what kind of boat did you buy? what does the title and registration say it is?
your boat could be rated for 65hp (seriously doubt that in a 14' boat), then your 65hp would be fine.....or it could be rated for 20hp in which case your over powered. the capacity tag will tell you. if your capacity tag is missing, you can look up the specs for your boat
if you still dont know what it is, you may have problems registering it. however until then, you can use the international law calculation that the coast guard also uses to determine the maximum hp of your boat.
https://www.gpo.gov/fdsys/pkg/CFR-2002-title33-vol2/xml/CFR-2002-title33-vol2-sec183-53.xml
so assuming your 14' boat has a 4' wide transom that is 15" tall and you have steering wheel and not a tiller handle your boat is rated for 25hp
if your 14' boat has a 5' wide transom that is 20" tall you have a steering wheel your boat is rated for 30hp
if your 14' boat has a 6' wide transom that is 25" tall and you have a steering wheel, your boat is rated for 45hp