2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 160Get this manual
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CRANK BALANCER DRIVEN GEAR KEY 12345678
Disassembling
1 Remove the small and large washers from the balancer shaft2 Note the position of the alignment marks for assembling purposes;