Cylinder head, cylinder, piston

Head and cylinder removal is very straightforward. Four nuts on the head hold it and the cylinder against the block with long rods threaded at each end, passing through the cylinder casing. When you've removed the head and cylinder, the rods can be removed by threading two nuts on the upper thread, and then turning using the innermost nut.

To release the piston from the conrod, simply remove the two circlips holding in the gudgeon pin, then push the gudgeon pin out from one side using a suitable bar or socket. Below you can see the gudgeon pin, circlips, bearing, piston and the conrod hanging loosely from the crank:



It looks like my piston has had a hard life, with lots of deposits on the top, and what look like scores or pitting on the wall: