As per title; these may be industry standard or proprietary to Yamaha.
first one is round, approx. 20 mm, with 5 male pins (position of 6th pin missing and notch in connector to align)
second, probably more common , is 3 way spade connector two are in parallel and 3rd one at right angle
The white square ish one is a Lucar connector, as I had used them om my car, easy to use and never caused an issue,
The round one, no idea
A link to a 6 way lucar fitting on fleabay
Beware that housing can be latched or non latched, your picture shows a latched connector.
Link to 3way
5way looks a little like this but pin spacing doesn't look correct
Link to 5Way
Do you have any idea from what or when the loom is from?
Scroll down a few and you will see the round one...
This is a good reference site for plugs
^^^ them is the ones!!!??
many thanks to all that replied - I wasn't hopeful for the round connector, no idea how you managed to find that - postage very reasonable from Japan.