No matter how much care is taken, however, the dismantling of mated parts invariably results in some degree of re-mating and consequent wear, and it is therefore never advisable, and should be done only when absolutely necessary. NEVER dismantle an engine in order to "decarbonise" it. Excess carbon is ejected by the engine automatically as it accumulates. For spares and service quote tel/fax (+44) (0)1625 423891 or enclose a stamped addressed envelope with your enquiry.
As for carbon, I would follow the manual.