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Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Kai's Mech Rider EVO

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71783 Kai's Mech Rider EVO

303 pieces in 118 part and color combinations, plus 4 minifigures.

LEGO counts 312 pieces. This inventory comes from a separate parts catalog and lists 323, including the 20 parts inside the minifigures; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

Black 75 pieces

  • Arm Mechanical with Clip [Thick Support] Black Part 98313 Element 6276867 or 6006739 ×1
  • Bar 6L with Stop Ring Black Part 63965 Element 6170421 or 6081988 ×1
  • Bracket 1 x 1 - 1 x 1 Inverted Black Part 36840 Element 6234695 ×2
  • Bracket 1 x 2 - 2 x 2 Inverted Black Part 99207 Element 6000650 ×6
  • Bracket 5 x 2 x 1 1/3 with Holes, Pin Bottom Black Part 11215 Element 6039194 ×1
  • Brick 1 x 2 x 2 with Inside Stud Holder Black Part 3245c Element 4618852 ×2
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Black Part 47457 Element 6394979 or 4218575 ×3
  • Brick Curved 4 x 3 with 3 Layers, 1 x 3 Cutout on Underside Black Part 66955 Element 6301371 ×2
  • Brick Curved, 3 x 1 with 1/3 Inverted Cutout Black Part 70681 Element 6328095 ×2
  • Brick Sloped 30° 1 x 2 x 2/3 Black Part 85984 Element 4548180 ×3
  • Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Black Part 3678b Element 4273703 or 4256421 ×2
  • Brick Sloped Inverted 45° 4 x 1 Double with 1 x 2 Recessed Black Part 32802 Element 6267482 ×1
  • Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth Black Part 57360 Element 6271535 ×4
  • Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes Black Part 98585 Element 6186133 or 6156897 ×4
  • Plate 2 x 2 Black Part 3022 Element 302226 ×2
  • Plate 2 x 6 Black Part 3795 Element 379526 ×5
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×2
  • Plate Special 1 x 2, Top Clip [Open O] Black Part 44861 Element 6347310 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Beam 1 x 13 Thick Black Part 41239 Element 4522933 or 4164422 ×2
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×2
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×2
  • Technic Brick 1 x 1 with Axle Hole Black Part 73230 Element 6344819 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×4
  • Technic Gear Rack 1 x 4 Black Part 3743 Element 6457282 or 4205760 ×3
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×11
  • Tyre 68.7 x 27 S Black Part 52985 Element 6429788 or 6262361 ×2

Red 55 pieces

  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2
  • Brick Arch 1 x 3 x 2 Red Part 88292 Element 6056816 ×2
  • Brick Curved 1 x 3 x 2 Inverted [Inside Bow] Red Part 18653 Element 6294331 ×2
  • Brick Curved 2 x 2 x 2/3 Red Part 15068 Element 6105976 ×2
  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Red Part 47457 Element 4220515 ×2
  • Brick Curved 4 x 3 with 3 Layers, 1 x 3 Cutout on Underside Red Part 66955 Element 6301367 ×2
  • Brick Curved Inverted 4 x 1 Red Part 13547 Element 6057432 ×2
  • Brick Round 1 x 1 Open Stud Red Part 3062b Element 306221 ×2
  • Brick Sloped Inverted 45° 4 x 1 Double with 1 x 2 Recessed Red Part 32802 Element 6431120 ×3
  • Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed Red Part 4871 Element 487121 ×1
  • Brick Special 1 x 1 with Clip Vertical [Open O Clip, Hollow Stud] Red Part 60475b Element 6345429 or 6115324 ×2
  • Brick Special 1 x 4 with 4 Studs on One Side Red Part 30414 Element 4177991 or 4157223 ×2
  • Brick Special 2 x 5 with Slope, Studs on Side Red Part 79897 Element 6371695 ×2
  • Brick Wedged, Curved Inverted 6 x 4 Red Part 43713 Element 6096487 or 4180465 ×1
  • Brick Wedged, Sloped 4 x 2 Triple Left Red Part 43710 Element 6431121 or 6293751 ×1
  • Brick Wedged, Sloped 4 x 2 Triple Right Red Part 43711 Element 6431123 or 6293750 ×1
  • Panel 1 x 2 x 1 [Rounded Corners] Red Part 4865b Element 6146217 or 486521 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×1
  • Plate 2 x 4 Red Part 3020 Element 302021 ×4
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Red Part 60470b Element 6360036 or 4556153 ×1
  • Plate Special 1 x 2, Top Clip [Open O] Red Part 44861 Element 6347308 ×6
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×6
  • Technic Brick Special 1 x 2 with Pin Hole and 1 x 2 Plate Red Part 73109 Element 6385920 ×2
  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Red Part 48267 Element 6285599 ×2
  • Tile 2 x 3 with Sand Red Ninjago Focus Banner Print Red Part 26603pr9970 Element 6421045 ×1
  • Wedge Plate 4 x 4 with 2 x 2 Cutout Red Part 43719 Element 6275399 or 4561034 ×1

Pearl Gold 47 pieces

  • Animal / Creature Body Part, Claw with Clip Pearl Gold Part 3171 Element 6426622 ×6
  • Brick Wedged, Curved 1 x 2 x 2/3 No Studs, Wing End Pearl Gold Part 47458 Element 6375715 or 6114676 ×2
  • Cone 1 x 1 [Top Groove] Pearl Gold Part 59900 Element 4529247 ×7
  • Large Figure Cover 4 x 3 x 2 with Bar, 4 Studs, Ridged Pearl Gold Part 79896 Element 6371693 ×1
  • Large Figure Weapon Sword with Axle Connector Pearl Gold Part 2144 Element 6508001 or 6417341 ×1
  • Large Figure Weapon Sword, 3 Bar Holes and Axle Hilt Pearl Gold Part 35633 Element 6330240 or 6270026 ×2
  • Plate Round 1 x 1 with Solid Stud Pearl Gold Part 6141 Element 4523159 1 spare in the box ×6
  • Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip] Pearl Gold Part 61252 Element 6284379 or 4523160 ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] Pearl Gold Part 2540 Element 6279731 ×1
  • Plate Special 1 x 2 with Three Teeth [Tri-Tooth] Pearl Gold Part 15208 Element 6207764 ×2
  • Tassel with 1 x 1 Round Stud Pearl Gold Part 25375 Element 6274711 or 6251548 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Pearl Gold Part 2412b Element 4490599 1 spare in the box ×5
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Pearl Gold Part 99563 Element 6207933 or 4651407 ×3
  • Weapon Sword / Katana / Shamshir with Capped Pommel [Square Guard] Pearl Gold Part 21459 Element 6116596 2 spares in the box ×5
  • Wheel 43.2 x 26 Technic Racing Small with 6 Pinholes Pearl Gold Part 56908 Element 6591614 or 6326764 ×2

Light Bluish Gray 33 pieces

  • Bracket 1 x 2 - 2 x 2 Light Bluish Gray Part 44728 Element 6117967 or 6009014 ×5
  • Brick Round 2 x 2 Truncated Cone Light Bluish Gray Part 98100 Element 6028324 ×3
  • Brick Special 1 x 2 with Handle Light Bluish Gray Part 30236 Element 4211580 ×1
  • Hinge Plate 1 x 2 Locking with 1 Finger On Top Light Bluish Gray Part 30383 Element 6265694 or 4219913 ×8
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×6
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Light Bluish Gray Part 60478 Element 4515369 ×2
  • Plate Special 2 x 2 with 2 Pin Holes Light Bluish Gray Part 2817 Element 4211376 ×2
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Light Bluish Gray Part 60483 Element 6265089 or 6004888 ×2
  • Technic Driving Ring Extension, 8 Ridges Light Bluish Gray Part 35186 Element 6307931 ×1
  • Technic Steering / CV Ball Joint Male 3L Light Bluish Gray Part 52731 Element 6262968 ×2
  • Tile Special 2 x 2 with Top Pin [Squared Holes] Light Bluish Gray Part 49153 Element 6313188 ×1

Dark Bluish Gray 24 pieces

  • Brick Sloped 45° 2 x 1 Double / Inverted with Bottom Stud Holder Dark Bluish Gray Part 3049d Element 6174938 ×2
  • Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Dark Bluish Gray Part 15571 Element 6076203 ×2
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 ×1
  • Plate Angled 2 x 2 with Step and Hole in Center Dark Bluish Gray Part 79846 Element 6395097 ×4
  • Plate Special / Shield Rectangular with 4 Studs, Handle Dark Bluish Gray Part 30166 Element 6258991 ×2
  • Plate Special 1 x 2 with 5.9mm Centre Side Towball Dark Bluish Gray Part 14417 Element 6414560 or 6338160 ×6
  • Plate Special 2 x 2 with 2 Pins Dark Bluish Gray Part 15092 Element 6284702 or 6066952 ×2
  • Technic Axle and Pin Connector Angled #3 - 157.5° Dark Bluish Gray Part 32016 Element 6366184 or 6283865 ×2
  • Technic Brick Special 2 x 2 with Pin Hole, Rotation Joint Socket Dark Bluish Gray Part 48169 Element 6278974 or 4225973 ×1
  • Technic Pin Connector Hub with 2 Axles Dark Bluish Gray Part 27940 Element 6167281 ×2

Tan 19 pieces

  • Plate 2 x 3 Tan Part 3021 Element 4118790 or 302105 ×2
  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×13

White 14 pieces

  • Bracket 1 x 1 - 1 x 1 White Part 36841 Element 6548291 or 6296132 ×2
  • Bracket 1 x 2 - 1 x 2 White Part 99781 Element 6552141 or 6548275 ×1
  • Headwear Accessory, Cross Horns / Bones White Part 2186a ×1
  • Weapon Axe, Bone/Sickle White Part 2186e ×2
  • Weapon Dagger, Bone White Part 2186c ×2
  • Weapon Sword, Bone White Part 2186d ×2
  • Weapon Throwing Star / Shuriken, Bone White Part 2186b ×4

Bright Light Orange 10 pieces

  • Brick Sloped 45° 2 x 2 Bright Light Orange Part 3039 Element 6020181 ×1
  • Plate 2 x 3 Bright Light Orange Part 3021 Element 6097503 or 4645048 ×2
  • Plate 2 x 8 Bright Light Orange Part 3034 Element 6133817 ×2
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Bright Light Orange Part 99563 Element 6236454 ×3
  • Wedge Plate 4 x 2 Left Bright Light Orange Part 41770 Element 6227662 ×1
  • Wedge Plate 4 x 2 Right Bright Light Orange Part 41769 Element 6227663 ×1

Trans-Light Blue 7 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Light Blue Part 3065 Element 6514268 or 6244910 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Light Blue Part 54200 Element 6245277 or 6073445 1 spare in the box ×2
  • Tile Round 1 x 1 Trans-Light Blue Part 98138 Element 6514192 or 6274739 1 spare in the box ×3

Trans-Orange 7 pieces

  • Cone 1 x 1 [Top Groove] Trans-Orange Part 59900 Element 6514017 or 6172233 ×1
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Orange Part 2654 Element 6513980 or 6171727 ×2
  • Wave / Flame Rounded with Base Rim Trans-Orange Part 6126b Element 6167741 or 4261397 ×4

Blue 6 pieces

  • Plate 1 x 2 Blue Part 3023 Element 302323 ×3
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×2
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×1

Reddish Brown 3 pieces

  • Technic Axle and Pin Connector Angled #2 - 180° Reddish Brown Part 32034 Element 6333110 or 6184719 ×3

Dark Red 1 piece

  • Tile 2 x 3 Dark Red Part 26603 Element 6359681 ×1

Flat Silver 1 piece

  • Plate Special 1 x 4 with Angled Tubes Flat Silver Part 61072 Element 4632100 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 71783-1 [No Color/Any Color] Part 10102070 Element 6422674 ×1

Minifigures 4 figures

  • Nya - EVO, Wraps, Shoulder Guard Minifigure, checked as a whole figure ×1
  • Kai - EVO with Wraps Minifigure, checked as a whole figure ×1
  • Bone King - Cape, Crossed Bones Minifigure, checked as a whole figure ×1
  • Bone Hunter Minifigure, checked as a whole figure ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

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Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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