For potential buyers info: The Complete HRC Kit contains the following items, this looks to be a partial kit.

Part Number Description Qty
16020-NKD-970 Carburetor Setting Kit 1
16050-NKD-970 Coil Spring COMP. 2
16092-NKD-970 Valve Plate 2
16115-169-004 Bar Clip 6
16131-NKD-970 Jet Needle J8YA 2
16132-NKD-970 Jet Needle J8YB 2
16133-NKD-970 Jet Needle J8YC 2
16165-NKD-970 Needle Jet Holder 2
16180-NKD-970 3 Way Joint COMP. 1
16215-MV4-000 Cap 2
93892-04020-10 Screw 4X20 2
96205-04005 Plug, Cone Type 4X5 2
99101-393-1700 Main Jet #170 2
99101-393-1720 Main Jet #172 2
99101-393-1750 Main Jet #175 2
99101-393-1780 Main Jet #178 2
99101-393-1800 Main Jet #180 2
99101-393-1820 Main Jet #182 2
99101-393-1850 Main Jet #185 2
99101-393-1880 Main Jet #188 2
99101-393-1900 Main Jet #190 2
99101-393-1920 Main Jet #192 2
99101-393-1950 Main Jet #195 2
99101-393-1980 Main Jet #198 2
99101-393-2000 Main Jet #200 2
99103-440-0400 Slow Jet #40 2
99103-440-0420 Slow Jet #42 2
99103-440-0450 Slow Jet #45 2
99106-NKD-970 Power Jet (#0) 2