just reading through your posts, Just like to say that i have a Yamaha 55AE and like you all say its very very hard to get much info on this engine.
From what i have learnt it was manufactured between 1974-79 (dont know my exact year as it does not have a year letter in the bottom corner of the serial plate)
I have been looking for a service manual for this engine for a long while but have never found one. Does any one have one ?
There are a couple of pictures of my boat and engine here
I have problems with mine as it has the wrong size prop for my boat and weight but trying to get around this issue.
I needed a simple plastic part for the throttle and rang up bhg marine and ever they could find the engine in there book as it only went back to 1984 but he did manage to find th part i needed, i should have ask him how.
Would love to find a parts manual and/or service manual, does any one know about one anywhere ?