2009 Suzuki 400 LTZ Quad Sport Service Manual, Page 193Get this manual
1D-51 Engine Mechanical: Primary drive gearBalancer drive gear Install the pin (1) and balancer drive gear (2)Special tool (A): 0993044520 (Rotor holder) Tightening torque Primary drive gear nut (a): 140 Nm (14.0 kgf-m, 101.5 lb-ft)
I933H1140198-01
Install the cam chain drive sprocket (3) and key (4) Install the primary drive gear (5) and washer (6)NOTE The conical curve side of washer (6) face outside
I933H1140201-01
Balancer driven gear Install the pin (1) Install the balancer driven gear (2) by aligning the matching marks "A"