Before starting, check that the crankshaft main bearing and big-end journals are free of burrs or evident signs of machining:
if necessary, clean the surfaces with very fine emery cloth and oil.
Check that the grooves are in perfect condition with no signs of forcing.
Thoroughly clean the crank pin (7) on the crankshaft (1) and lubricate with ROTHEN EXTRA additive.
The big-end cap screws may only be used for one tightening.
Tighten the screws (3) by hand.
If this proves difficult or if the screws jam, undo them and lubricate them again.
Remove excess grease. Tighten the screw by hand until the head seats against the connecting rod.
Temporarily fit the gudgeon pin (L) to align the connecting rods.