Hello tiger,
My series of images on page 1 of this thread may help you.
Your sequence to clean the rings are:
Image 4: Remove starter, 3 x 12mm bolts
Image 5: Stop the piston & crank moving (use rope or piece of wood, place it in front of the piston, put head back on or lock the blade boss in a vice)
Image 6: undo crankpin, there are spaecial tools to do this, some use a punch or screwdriver, using care to loosen it.
Image 8: remove head, 4 x 12mm bolts.
With draw piston to inspect and clean it.
Let me know if any of this makes sense.
