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Onan
Lawn & Garden Engine

Model # B43M-GA016 Official Onan engine

Here are the diagrams and repair parts for Official Onan B43M-GA016 engine, 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 277 parts  |
Element 140-1216
#4

Fuel system diagram

Element

Part #140-1216

Replaced by #45-083-02-S

?
Manufacturer substitution
This part replaces 140-1216. Substitute parts can look different from the original.
This item is not returnable
$25.09 | 
19% OFF Phone Price : $31.09
In Stock
Lawn & Garden Equipment Engine Pump Body Gasket 142-0542
#13

Carburetor (with integral fuel pump) (142-0660) diagram

Lawn & garden equipment engine pump body gasket

Part #142-0542

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

Vacuum Port Cap Clamp 503-0301
Vacuum port cap clamp

Part #503-0301

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

Yoke 150-1187
#4

Gearcase diagram

Yoke

Part #150-1187

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

Key 515-0103
#15

Crankshaft and fylwheel diagram

Key

Part #515-0103

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

Screw 142-0540
#11

Carburetor (with integral fuel pump) (142-0660) diagram

Screw

Part #142-0540

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

Scr Br Bx Cr 815-0358
#5

Breaker box diagram

Scr br bx cr

Part #815-0358

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

Left Side - Begin Spec B 110-2561
#37C

Cylinder block diagram

Left side - begin spec b

Part #110-2561

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

Screw 800-0541
#41B

Cylinder block diagram

Screw

Part #800-0541

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

Screw 800-0545
#11B

Gearcase diagram

Screw

Part #800-0545

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.

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Why does my lawn mower run rough?

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

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Why does my lawn mower cut unevenly?

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

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Why does my lawn mower vibrate a lot?

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

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Why won't my lawn mower start?

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

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Why does my lawn mower stall?

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

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Why won't my lawn mower move?

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

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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.

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How to replace a lawn mower spark plug

Take a few minutes to replace the spark plug during your lawn mower's annual tune-up or if the spark plug is burnt or cr…

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 15 minutes or less
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Check your lawn mower blade regularly and replaced it if it's bent or damaged. …

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How to replace a lawn mower flywheel key on a flathead engine

When you hit a hard object with your mower, the flywheel can shear to protect more expensive components. Learn how to re…

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Repair difficulty
Time required
 45 minutes or less

Effective articles & videos to help repair your lawn & garden engines

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

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Top questions about Sears and Sears PartsDirect

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What are the main components of a lawn mower?

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