Today I will re-assemble the larger of the two breather covers, as it had a small oil leak that burnt on the exhaust from time to time ( nasty smell ). I did the smaller one a couple years back and it's holding firm. On
reading all of the threads on this I have come to the conclusion that its not so much the torque of the screws that stop the oil seeping, but certainly the seal of the gasket cement. To that degree all mating surfaces
must be totally oil & old bits of sealant free ... immaculate. The sealant will then stick well to the surfaces. The screws just hold everything in place to where it should be, and the work of the tightening torques on the
screws / bolts, isn't so much to create a good seal ( as you would expect, as say, with a paper type gasket ) but just to make sure that the screws / bolts stay where they are and don't vibrate loose. Tightening torques
seem to be 10 n-m ( 7.4 ft-lb ) for the two long screws, .... & 5 - 6 n-m ( 4ft-lb ) on the little alluminium screws. Do not over tighten.