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LEGO Missing Piece Checker

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.

Twin X-treme RC

Checking

8184 Twin X-treme RC

239 pieces in 93 part and color combinations.

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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

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Piece checklist

Plates 66 pieces

  • Plate 1 x 10 Black Part 4477 Element 447726 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×4
  • Plate 1 x 6 Black Part 3666 Element 366626 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate 1 x 2 Green Part 3023 Element 302328 ×4
  • Plate 1 x 4 Green Part 3710 Element 371028 ×2
  • Plate 1 x 8 Green Part 3460 Element 346028 ×2
  • Plate 2 x 6 Green Part 3795 Element 379528 ×2
  • Plate 4 x 6 Green Part 3032 Element 4116671 ×1
  • Plate 1 x 10 Red Part 4477 Element 447721 ×2
  • Plate 1 x 4 Red Part 3710 Element 371021 ×1
  • Plate 1 x 8 Red Part 3460 Element 346021 ×2
  • Plate 1 x 2 Trans-Red Part 3023 Element 6514003 or 6240212 ×3
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×8
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×1
  • Plate 1 x 6 White Part 3666 Element 6552107 or 6548265 ×6
  • Plate 1 x 8 White Part 3460 Element 6550141 or 346001 ×3
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×2
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×1
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×6
  • Plate 2 x 8 White Part 3034 Element 6552101 or 303401 ×4
  • Plate 4 x 8 White Part 3035 Element 6609533 or 303501 ×2

Tiles 26 pieces

  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×7
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×7
  • Tile 1 x 2 with Groove Green Part 3069b Element 306928 ×4
  • Tile 1 x 6 with Groove Green Part 6636 Element 6035336 or 6019630 ×3
  • Tile 1 x 6 with Groove Red Part 6636 Element 4113858 ×1
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×2

Bricks Curved 20 pieces

  • Brick Curved 6 x 2 Black Part 44126 Element 4180548 ×2
  • Brick Curved 4 x 1 No Studs [Stud Holder with Asymmetric Ridges] Green Part 61678 Element 4541188 or 4541100 ×4
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top Red Part 6091 Element 6184782 or 609121 ×2
  • Brick Curved 4 x 1 No Studs [Stud Holder with Asymmetric Ridges] Red Part 61678 Element 4520782 ×2
  • Brick Curved 1 x 2 x 1 1/3 with Curved Top White Part 6091 Element 6285777 or 609101 ×2
  • Brick Curved 2 x 4 x 1 1/3 White Part 6081 Element 608151 or 608101 ×2
  • Brick Curved 3 x 1 No Studs White Part 50950 Element 6548268 or 4249112 ×4
  • Brick Curved 6 x 1 White Part 42022 Element 4160387 ×2

Wheels and Tyres 20 pieces

  • Tyre 30.4 x 14 Offset Tread Black Part 30391 Element 4140670 or 3039126 ×4
  • Tyre 37 x 18 R Balloon Black Part 56891 Element 6589426 or 6518543 ×4
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Black Part 55982 Element 4517737 ×4
  • Wheel Cover 9 Spoke - 24mm D. Red Part 62701 Element 4621953 or 4541189 ×4
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes White Part 55982 Element 6092256 or 4490128 ×4

Plates Special 17 pieces

  • Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×1
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Black Part 3839b Element 383926 Also in Dark Bluish Gray ×2
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Dark Bluish Gray Part 3839b Element 4263176 Also in Black ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Green Part 2540 Element 4542391 or 4519974 ×1
  • Technic Plate 2 x 6 [5 Holes] Light Bluish Gray Part 32001 Element 4211542 ×2
  • Plate Special 4 x 6, Studs on 3 Edges Red Part 6180 Element 6315022 or 4624534 ×1
  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×1
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×1
  • Plate Special 1 x 2 [Side Handle Closed Ends] White Part 48336 Element 6552125 or 4222017 ×7

Plates Round Curved and Dishes 15 pieces

  • Plate Round Corner 3 x 3 Green Part 30357 Element 6062166 or 4541187 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 2 spares in the box ×9
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×4

Tiles Special 15 pieces

  • Tile Special 1 x 1 with Clip and Straight Tips Black Part 2555 Element 255526 ×11
  • Tile Special 1 x 2 Grille with Bottom Groove Dark Bluish Gray Part 2412b Element 4210631 ×1
  • Tile Special 2 x 2 with Top Pin Dark Bluish Gray Part 2460 Element 4211129 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove White Part 2412b Element 6601902 or 241201 ×2

Bricks 14 pieces

  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×2
  • Brick 2 x 3 Black Part 3002 Element 300226 ×1
  • Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×1
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×1
  • Brick 1 x 16 Red Part 2465 Element 6378410 or 246521 ×2
  • Brick 1 x 12 White Part 6112 Element 6548281 or 611201 ×2
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×2
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×1
  • Brick 2 x 2 Corner White Part 2357 Element 6552088 or 6548253 ×2

Bricks Special 10 pieces

  • Brick Special 1 x 2 with Handle Black Part 30236 Element 4288212 or 4113243 ×6
  • Brick Special 1 x 1 with Headlight Red Part 4070 Element 407021 ×2
  • Brick Special 1 x 4 with 4 Studs on One Side Red Part 30414 Element 4177991 or 4157223 ×2

Hinges, Arms and Turntables 8 pieces

  • Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth Black Part 44302a Element 4183060 ×2
  • Hinge Plate 1 x 2 Locking with 1 Finger On End, with Groove White Part 44301a Element 4183035 ×2
  • Hinge Plate 1 x 2 Locking with 1 Finger On Top White Part 30383 Element 6265695 or 4262011 ×2
  • Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth White Part 44302a Element 4183048 ×2

Transportation - Land 8 pieces

  • Wheel Arch, Mudguard, 1 1/2 x 6 x 1 [Arch Extended] White Part 62361 Element 6476001 or 4523556 ×8

Technic Pins 3 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×1

Bricks Sloped 2 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Red Part 54200 Element 6245252 or 4244363 1 spare in the box ×2

Electronics 2 pieces

  • Control Unit, IR, Power Functions, with Dark Bluish Gray Bottom Light Bluish Gray Part 58122 Element 6225576 or 6074396 ×1
  • Motor, RC with Steering Mechanism and Receiving Unit, Dark Bluish Gray Base [Complete Assembly] Light Bluish Gray Part 64766 Element 4540125 ×1

Technic Axles 2 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×1

Technic Bushes 2 pieces

  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×2

Technic Connectors 2 pieces

  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Black Part 6553 Element 4107765 or 655326 ×2

Bricks Wedged 1 piece

  • Brick Wedged, Curved Triple 4 x 6 x 2/3 with 4 Studs Green Part 52031 Element 4503291 ×1

Stickers 1 piece

  • Sticker Sheet for Set 8184-1 [No Color/Any Color] Part 84568 Element 4540337 ×1

Technic Beams 1 piece

  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×1

Technic Bricks 1 piece

  • Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×1

Technic Panels 1 piece

  • Technic Car Spoiler 3 x 8 [Three Holes] White Part 61073 Element 4527518 ×1

Technic Steering, Suspension and Engine 1 piece

  • Technic Steering Wheel Large Black Part 2741 Element 4125213 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 3 x 6 x 1 Curved with 2 Circular Stud Holders in Bottom Black Part 62360 Element 6024087 or 6000840 ×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

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

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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