The coil is in line with front wheel spray. If you try to run the bike in the dark, you'll see the sparks as it's shorting out.
Take the tank off, remove, clean and dry the coil, get all the WD40 off, then coat the entry and exit points (electrical connectors in, HT lead out) with clear silicon sealant. Allow it to dry and it should be fine. Check the plug is a cosy fit, and reasonably well sealed in the HT lead while you're there.
I've also added a fender extender. It's only 6"" longer, (genuine Yamaha part), but I've had no problems now in 3 months, despite a weekly mud plug!
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