Design and function
Pistons and connecting rods Pistons are made of aluminum and have three piston rings; on top is a “Keystone” compression ring, in the middle a compression ring with rectangular cross-section and at the bottom a spring loaded oil wiper ring. The connecting rods are forged and the lower crank bearing is “split” i.e. divided through a flat, unmachined surface.
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The upper end features a pressed-in bushing that is lubricated via a drilled channel in the connecting rod.
