Ok - as recommended by Tyler, I got out the very cheap and nasty endoscope I have - inserted it into the mower this morning but alas I really could not discern much at all - it's just such a cheap one that the focal length seems to struggle with showing much.
What I can safely say though, just from eyeballing it through the hole myself using a torch, is that there's a significant amount of carbon in the cylinder - certainly more than I've seen previously.
Due to the recent break of the dry spell here - I'm going to have to mow today - I'll pop the BPR5ES plug in and see if that assists - the PEA injector cleaner is onroute - but I don't know if I'd be recommended using something more robust to remove some of that built up carbon in a separate process?
I'm still unsure if I should adjust the carb screws to make it a tad less rich or if this oil 'blend' I put together from left over odds and ends, has somehow played a part in this.
