From the motors I’ve seen that "look" to still be original
the forward gas cap was use on both motors passing
Serial# 1000 by maybe a few hundred. This not to
say that you wont find the later tanks on the early motors
or visa versa because parts do get moved around.
There were actually 3 variations in the Pal gas tank
in the 5 years of production.
A "Boathouse Repair" is one thats done without having tools or the skills to do it properly.