Sears
Cycling

Model # 502457490 Official Sears 20" moto-cross bicycle

Here are the diagrams and repair parts for Official Sears 502457490 20" moto-cross bicycle, as well as links to manuals and error code tables, if available.

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Model diagram and schematic

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Showing 10 of 105 parts  |

R Wheel Assy 303013C
#21

Unit parts diagram

R wheel assy

Part #303013C

The manufacturer no longer makes this part, and there's no substitute part

Axle Mx 303520
#11

Unit parts diagram

Axle mx

Part #303520

The manufacturer no longer makes this part, and there's no substitute part

Tie 32618
#38

Unit parts diagram

Tie

Part #32618

The manufacturer no longer makes this part, and there's no substitute part

Sprocket 300424
#17C

Shimano rear hub diagram

Sprocket

Part #300424

The manufacturer no longer makes this part, and there's no substitute part

Nut 15X42
#1

Fork and spring assembly diagram

Nut

Part #15X42

The manufacturer no longer makes this part, and there's no substitute part

Spk 7-9/16 303155
Spk 7-9/16

Part #303155

The manufacturer no longer makes this part, and there's no substitute part

Tank 32895BJD
#40

Unit parts diagram

Tank

Part #32895BJD

The manufacturer no longer makes this part, and there's no substitute part

Arm Washer 300461
#3

Shimano rear hub diagram

Arm washer

Part #300461

The manufacturer no longer makes this part, and there's no substitute part

Dust Cap 304799
#16

Bendix coaster brake diagram

Dust cap

Part #304799

The manufacturer no longer makes this part, and there's no substitute part

Wedge 302107
#5

Unit parts diagram

Wedge

Part #302107

The manufacturer no longer makes this part, and there's no substitute part

Symptoms for gas walk-behind mowers

Choose a symptom to see related walk-behind mower repairs.

Main causes: dirty carburetor, bad spark plug, clogged air filter, engine choke problems, clogged gas cap vent…

Main causes: stale gas, engine needs tune up, bad spark plug, dead battery, bad recoil starter, faulty safety switch, ba…

Main causes: uneven wheel height settings, damaged wheel, dull or damaged cutting blade…

Main causes: drive control cable failure, worn or broken drive belt, bad transmission, broken drive wheel…

Main causes: engine needs tune up, dirty or clogged carburetor, damaged flywheel key…

Main causes: damaged cutting blade, loose cutting blade, damaged flywheel key, engine needs tune up…

Repair guides for gas walk-behind mowers

These step-by-step repair guides will help you safely fix what’s broken on your walk-behind lawn mower.

How to replace a lawn mower recoil starter on an OHV engine

How to replace a lawn mower recoil starter on an OHV engine

Replace the recoil starter if it doesn't move when you pull the starter rope.…

Repair difficulty
Time required
 15 minutes or less
How to replace a lawn mower transmission

How to replace a lawn mower transmission

Learn how to replace the transmission on your lawn mower if it's locked up or won't drive the wheels.…

Repair difficulty
Time required
 60 minutes or less
How to replace a lawn mower carburetor

How to replace a lawn mower carburetor

The carburetor mixes air with fuel to drive the piston. Replace the carburetor if it's clogged or damaged.…

Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas walk-behind mowers

Use the advice and tips in these articles and videos to get the most out of your walk-behind lawn mower.

How to enjoy all the online benefits we offer on our Sears PartsDirect website

How to enjoy all the online benefits we offer on our Sears PartsDirect website

Learn about all the convenient features on our Sears PartsDirect website that make your parts purchases easier.…

Top questions about Sears and Sears PartsDirect

Top questions about Sears and Sears PartsDirect

Get answers to frequently asked questions about Sears and Sears PartsDirect.…

Lawn mower won't start troubleshooting video: can't pull recoil pull cord

Lawn mower won't start troubleshooting video: can't pull recoil pull cord

A blade obstruction, bad recoil starter or locked-up engine can prevent the pull cord on your mower from working. See ho…