The camshaft and the tappets are even impossible to remove without splitting the crankcase. After the crankcase is cracked, the tappets are to be examined in their bores, whether there is undue side-play in them, and the surfaces in contact with the camshaft lobes must be smooth, clear and shiny. Pitting or serious wear signs signal the necessity of renewal, but the refacing can be performed in case of having the appropriate grinding equipment, which is to be considered as cost-effective. The lobes of the camshaft should be inspected to show any flat spots or in the case of pitting or severe wear upon the bearing surface; minor blemishes should be cut out by means of oil stone on 120 grains and polished with a 300 grains stone. Similarly, the bearing journals are to be checked and the camshaft bearings are renewable. Furthermore, the gear wheel welded on the end of the camshaft must be firmly attached, and its teeth ought to be checked to confirm that they are not broken off or even overworn. Adding a new gear wheel to the existing camshaft may be a possibility, depending on facilities available locally, but is not something that the owner can afford to do.