2006 Arctic Cat ATVs 400/400TBX/400TRV/500/500TBX/500TRV/650H1/650 V-Twin Service Manual, Page 101Get this manual
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2 Install the 4th drive gear making sure the bushing is in position; then install the other 4th drive washer onto the countershaftSecure with the circlip
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3 Install the 3