(05-01-17, 12:25 PM)Bretty link Wrote: Actually... my bike sits outside in the rain on the sidestand all year round, so rain water does sit around spark plug 3 and it can sit in a puddle of water for weeks at a time. It does corrode and will seize into the head if left. However, I'm not sure there is any cap that would prevent this corrosion.

I don't think any cap prevents water getting around the plug and top of the head. I have the straight NGK's fitted to my bike and they are really good for the money. To get around the issue with corrosion, I actually change and regrease plug 3 every 6months. After 6 months it develops a misfire and it tricky to get out.

But I really don't think the OEM's are any better. Get the NGK's!