I have a 1960 Lonestar coronado 14 foot Aluminum boat. The serial number tag on the back has been scratched and painted over. I have put an 8 HP Yamaha shortshaft but it's just not enough for the wind on bigger lakes. I need to know if a 25 HP Yamaha is too much motor or just right. I have re-inforced the inside of the transom with a steel plate so if anybody has any info on these older lonestar max motor weights on this model. Thanks.