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

https://www.ebay.co.uk/itm/6-Way-6-35mm-Lucar-Power-Connector-Kit-Car-Trike-Bike-Van-Caravan-Wiring-Repair/191921745240?hash=item2caf6d6d58:m:mRy2Pe-I khQwdMA1MZ6yc8g

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?

Cheers
Davie

Scroll down a few and you will see the round one...

http://www.easternbeaver.com/Main/Elec__Products/Connectors/Sealed/YPC/ypc.html

This is a good reference site for plugs

http://www.easternbeaver.com/Main/Elec__Products/Connectors/connectors.html

^^^ 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.