I have a 2002 Lund w '03 Honda 50 hp 4 stroke outboard - boat and motor are well cared for and run great - this season I have noticed a burning smell occasionally from the motor - it is not a bad smell and a friend recently said it was from a camp fire when we fished just off an island - then the smell came again and was definitely the motor - the smell does not last long - the water stream is good and constant and I can not figure what it may be - any opinions? thanks!