Bonnie was using oil during the 2015 riding season so during 2016 winter maintenance I went for a rebore and new pistons and rings. These photos show cylinder head and piston condition upon disassembly as well as a few techniques for removing the grudgeon, or wrist pins.
Good news is there's no leakage between the cylinders thanks to CopperCoat, but pistons show signs of burning oil.
Definitely been burning some oil here!
Exhaust PRT shows signs of having leaked a bit around the tappet guide block.
Use whatever you have around to protect the connecting rods. Foam pipe insulation works well, or just cover the crankcase studs with rubber bits and secure the rods to them with rubber bands the way I've done here.
Ahead of heating the pistons, I used snow packed into plastic bag to chill the wrist pins for easier removal.
Threaded rod, washers and nuts, and a couple pieces of pipe are all it takes to work up a homemade wrist pin extractor. I didn't have a large enough washer to cover the indentation around the wrist pin bosses so I used a file tang as a shim.
Keep those connecting rods well protected!
