So, productive weekend was had.
This happened:
Performance has been less than stellar so decided to pull down/rebuild top end of engine. Rings are shot as going by the amount of carbon and gunk all the way down the piston body past the rings been getting a shit loan of blow through.
Gudgeon/wrist pin was being an absolute prick and had to CRC/dry and then heat it with propane torch to get the thing out!
The piston itself is scored all over so appears to have been overheating and touching the sides. Has also got a load of crap under the piston - im not sure what that means but dont think its supposed to be there!
Inside of the barrel:
Barrel and piston going to KG motorcycles in the morning to get bored out and refreshed.
Whats best thing to clean all the shite off the outsides of the barrel/head off? Surely this must be impacting cooling ability!