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The silicone treatment has worked a treat - it's still in there, and still keeping out the water and dirt. If I need to stip the engine out again - it'll just be a case of clean it up and put fresh silicone in - about as easy a fix as you can get. re your other points - it's easy to slag off...

I've had a loud whirring noise which mainly comes in lower gears, pedalling at a high cadence and in eco mode - do many people get this?

I put a little in the front of the casing too - but there was no ingress of dirt from this side so not really necessary. Silicon is easy to pick off - so if it doesn't work, then there's no issues. Nothing ventured - nothing gained !!!

Having seen all the gunk and mud getting into the gap near the top of the casing on the drive side, I decided to strip the motor out and have a look. It was much worse than I thought - all of it congregates around the power lead input. I'm sure others may have come up with alternative fixes...