So that's about the size of it. It took me the best part of a day. So you need to decide whether you fancy the challenge and save some cash or on the other hand if cash is no object then take it to the dealer.
If you are taking the job on it needs to be done slowly and surgically. There is lots of scope for screwing up. Damaging the radiator, brake pipes, cables, etc. A lot of TLC is needed.
Here are the old plugs:
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I took the advice and applied some dielectric grease to the plug coil rubbers to help them seat properly and I had no trouble at all getting them back in. You still have to apply some force to get them to 'click' back into position.
Don't try and remove the fans from the radiator. It can be done once the radiator is dropped but nothing is really gained. Also my previous idea of lifting up the tank will gain nothing as far as the plug change is concerned so my advice is don't bother with that.
Yamaha certainly did not make the job easy. I have to say it was the trickiest plug change I have ever done; far more difficult than my old CBF600 SA (2009).
So there you are. A slightly different approach to Spider Eye in the original post.
Hope it helps.
See you all soon.