I have a 1975 Evinrude 85hp v-4 it was stored unused, indoors for over 20 years before I started using it 3 years ago. It runs well but my question is should I expect the coils and powerpack to naturally start to weaken or fail due to age and replace them as a matter of pre-emptive maintenance? The only problem I've had with the motor is I had 1 plug foul out last year but it could have been due to weeds on the lower unit. The compresion is 130 on all four cylinders.