Kawasaki S2 (1972-1973) [98/129] Rear shock absorbers

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9 REAR SHOCK ABSORBERS 1 Construction The shock absorbers constitute the rear suspension protecting the rider and vehicle from road shock and vibration and thereby increasing riding comfort and lengthening vehicle life To further absorb vibration from small irregularities in the road surface the shock absorbers are mounted with rubber bushings at the top and bottom The shock absorber consists of springs an inner cover outer shell cylinder piston rod piston and shock absorbing oil The basic tension of the spring the initial load is adjustable in three steps to comform with road and loading con ditions and rider comfort between the cylinder and the outer shell also returns to underneath the piston by pushing open base valve A normally held shut by valve spring D The resistance of the flowing oil checks the tendency of the outer spring to suddenly expand to its full length The extension stroke is completed when the inner spring hits the stopper at the top of the cylinder GT Outer Inner Spring Piston 2 Operation a Compression When the rear shock absorber receives a load the outer spring is compressed and at the same time the cylinder rising in the outer shell causes pressure on the oil underneath the piston The oil flows through the piston orifice pushes up the npn retum valve held down by valve spring C and enters the space above the piston A small amount of oil also flows through the opening of base valve A pushes down base valve B and enters the oil chamber between the cylinder and the outer shell The resistance to this oil flow in addition to spring tension constitutes buffering action The compression stroke is terminated when the cylinder strikes the rubber at the top end of the piston rod Í v Piston Valve Cylinder Valvo Spring Base Wve_A Base Valve B Outer Shell 3 Disassembly The rear shock absorbers arc a non disassem part and must be replaced as an assembly defective To remove the shock absorbers take out mounting bolts 4 Inspection a Check the shock absorbers for leaking A leaking unit should be replaced b Extension When the outer shell moves downward together with the cylinder due to spring force the oil in the space above the piston goes through the piston orifice pushes down the piston valve goes through the valve and back into the space under b Since during compression the spring force much greater than the oil damping force damping force is very difficult to check damping force during expansion can be ea inspected however Compress the shock abso and release it If it does not return smoo without jerking or snapping back or if o

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