Have just bought 2 Evinrude 4's, model 49B6B serial numbers B7240 and B7251 both of which I'd like to get running for next summer - they're Belgium built, can anyone tell where to go to check actual build year for Evinrude / Johnson? Also would be interested to hear the general view of these motors, whether reliable or not and anything problems that I need to keep an eye out for? One needs new pistons, are they easy parts to get? I have a '63 Lightwin 3HP and a '57 Johnson 3HP which effectively look identical in dimension, what were the major differences?