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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.

Checking

42170 Kawasaki Ninja H2 Motorcycle

643 pieces in 153 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 4 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 17 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

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.

Technic Panel Fairing #21 5L Small Smooth, Side B Black ×1 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Panel Fairing #22 5L Small Smooth, Side A Black ×3 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Panel Fairing #7 3L Very Small Smooth, Side A Black ×6 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Panel Fairing #8 3L Very Small Smooth, Side B Black ×6 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Special 46 pieces

Technic Link, Reinforced, with Beveled Edge Black Part 14696 Element 6044702 1 spare in the box ×38
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×6
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Trans-Red Part 48267 Element 6514318 or 6275769 ×2

Tiles Round and Curved 17 pieces

Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 1 spare in the box ×3
Tile Round 3 x 3 Black Part 67095 Element 6376695 ×2
Tile Round 1 x 1 Bright Green Part 98138 Element 6353793 1 spare in the box ×2
Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 ×1
Tile Round 1 x 1 Light Bluish Gray Part 98138 Element 6284071 or 4650260 1 spare in the box ×8
Tile Round 1 x 2 Half Circle Light Bluish Gray Part 1748 Element 6510070 or 6408629 1 spare in the box ×1

Technic Bushes 16 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 ×8
Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×8

Technic Gears 14 pieces

Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×1
Technic Gear 12 Tooth with Axle Hole Blue Part 69778 Element 6396479 ×2
Technic Driving Ring 3L Dark Bluish Gray Part 18947 Element 6100931 ×1
Technic Driving Ring Extension, 8 Ridges Dark Bluish Gray Part 35186 Element 6484624 ×1
Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×1
Technic Gear 20 Tooth with Clutch on Both Sides Green Part 81346 Element 6391159 ×1
Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×3
Gear Shifter Orange Part 35188 Element 6227330 ×1
Technic Gear 16 Tooth with Clutch on Both Sides Red Part 18946 Element 6100930 ×3

Technic Steering, Suspension and Engine 13 pieces

Technic Steering Wheel Hub Holder with 2 Pin Holes and 2 Axle Holes, No Slots Black Part 65766 Element 6352693 ×1
Brake Disc with CV Ball Joint Light Bluish Gray Part 35189 Element 6293340 ×1
Technic Crank Disc Light Bluish Gray Part 4368 Element 6452845 ×4
Technic Shock Absorber 11L with Internal Spring, Black Top Light Bluish Gray Part 65151c02 Element 6483561 ×2
Technic Piston Yellow Part 4369 Element 6452846 ×4
Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly] Yellow Part 76537 Element 7653726 or 6027566 ×1

Bricks Round and Cones 10 pieces

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Black Part 25214 Element 6179182 ×1
Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×1
Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Light Bluish Gray Part 25214 Element 6151349 ×8

Wheels and Tyres 6 pieces

Tyre 94.2 x 22 Motorcycle Racing Tread Black Part 67140 Element 6609951 or 6294605 ×1
Tyre 94.2 x 22 Motorcycle Racing Tread, Narrow Black Part 88516 Element 6609953 or 6261718 ×1
Wheel 75 x 17 Motorcycle Black Part 88517 Element 6314354 or 6176748 ×2
Brake Disc 6 x 6 Light Bluish Gray Part 65416 Element 6285654 ×2

Bars, Ladders and Fences 4 pieces

Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×1
Lever Small Base with Black Lever Black Part 298c02 Element 73587 1 spare in the box ×2
Bar 3L Bright Green Part 87994 Element 6161772 1 spare in the box ×1

Plates Special 4 pieces

Plate Special 1 x 2 with Door Rail Black Part 32028 Element 4107761 ×1
Plate Special Round 1 x 2 Half Circle with Stud (Jumper) Black Part 1745 Element 6510061 or 6438919 ×2
Plate Special 2 x 2 with 2 Pins Dark Bluish Gray Part 15092 Element 6284702 or 6066952 ×1

Tiles 4 pieces

Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×2
Tile 2 x 3 Black Part 26603 Element 6162892 ×1
Tile 1 x 2 with Groove Light Bluish Gray Part 3069b Element 4211414 ×1

Bricks Wedged 3 pieces

Brick Wedged, Curved 2 x 1 with Stud Notch Left Black Part 29120 Element 6181720 ×1
Brick Wedged, Curved 2 x 1 with Stud Notch Right Black Part 29119 Element 6181713 ×1
Brick Wedged, Curved 4 x 4 No Top Studs Black Part 47753 Element 4219107 ×1

Plates 3 pieces

Plate 1 x 5 Black Part 78329 Element 6350415 ×3

Bricks Sloped 2 pieces

Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Light Bluish Gray Part 54200 Element 4521921 or 4244372 1 spare in the box ×2

Bricks Special 2 pieces

Brick Special 1 x 1 with Headlight Dark Bluish Gray Part 4070 Element 4211044 ×2

Large Buildable Figures 2 pieces

Large Figure Armor Plate, Small Black Part 28220 Element 6188823 ×2

Plates Round Curved and Dishes 2 pieces

Plate Special 1 x 3 Rounded with 3 Open Studs Black Part 77850 Element 6428168 ×2

Stickers 1 piece

Sticker Sheet for Set 42170-1 [No Color/Any Color] Part 10105326 Element 6462839 ×1

Technic Beams Special 1 piece

Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Light Bluish Gray Part 61408 Element 6331859 ×1

Windscreens and Fuselage 1 piece

Windscreen 7 x 6 1/2 x 2 Motorcycle with Black Border Print Trans-Clear Part 5401pr0001 Element 6661102 or 6480502 ×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.

LEGO Missing Piece Checker

42170 Kawasaki Ninja H2 Motorcycle

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 178 pieces

Technic Beams 109 pieces

Technic Connectors 82 pieces

Technic Axles 76 pieces