I'm still on the stock airbox and filter. Just changed the filter yesterday. Nothing unusual there.
I had done the oil filler cap test and yes there was only alittle pressure there. Cap can be removed easily.
I guess it's a good idea to clean it off and see what happens.
Actually I noticed a grimy oily patch on the cylinder head and was shocked as it looked like cracks. But after cleaning off that patch I was relieved to find no cracks and that the oil came from the vent hose above it.
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