Can’t find your part?   Contact us:
+1-309-603-4777
Sears Parts Direct
Orders

  • Keep track of the models you own in your profile

    Sign in or Register to view or add models

Schedule a repair
MTD
Lawn & Garden Engine

Model # 4P90MUA Official MTD engine

Here are the diagrams and repair parts for Official MTD 4P90MUA engine, as well as links to manuals and error code tables, if available.

There are a couple of ways to find the part or diagram you need:

  • Click a diagram to see the parts shown on that diagram.
  • In the search box below, enter all or part of the part number or the part’s name.

Not all parts are shown on the diagrams—those parts are labeled NI, for “not illustrated”.

We encourage you to save the model to your profile, so it’s easy to access parts and manuals for your appliance whenever you log in.

For DIY troubleshooting advice and repair guides, visit our repair help section.

Model diagram and schematic

SEARCH WITHIN THIS MODEL

?

This is the number corresponding to the part on the diagram / schematic

Search
ALL PARTS
Showing 10 of 173 parts  |
Lawn & Garden Equipment Engine Spark Plug 951-10292
#162

Cylinder head diagram

Lawn & garden equipment engine spark plug

Part #951-10292

Replaced by #951-10292A

?
Manufacturer substitution
This part replaces 951-10292. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$6.47 | 
60% OFF MSRP : $16.00
In Stock
Lawn & Garden Equipment Engine Air Filter 951-12260
#126

Air intake diagram

Lawn & garden equipment engine air filter

Part #951-12260

Replaced by #937-05065A

?
Manufacturer substitution
This part replaces 951-12260. Substitute parts can look different from the original.
BEST SELLER
$22.20 | 
23% OFF MSRP : $29.00
In Stock
Lawn & Garden Equipment Engine Carburetor Gasket 951-12261
#136

Carburetor diagram

Lawn & garden equipment engine carburetor gasket

Part #951-12261

BEST SELLER
This item is not returnable
$6.35 | 
14% OFF Phone Price : $7.35
In Stock
Lawn Tractor Engine Manifold Gasket 951-12258
#130

Air intake diagram

Lawn tractor engine manifold gasket

Part #951-12258

Replaced by #951-12258A

?
Manufacturer substitution
This part replaces 951-12258. Substitute parts can look different from the original.
This item is not returnable
$6.35 | 
14% OFF Phone Price : $7.35
In Stock
Lawn & Garden Equipment Engine Stator 951-12224
#44

Ignition & electrical diagram

Lawn & garden equipment engine stator

Part #951-12224

$83.26 | 
24% OFF MSRP : $110.00
In Stock
Lawn Tractor Engine Sump Filter 951-12249
#100

Crankshaft & crankcase cover diagram

Lawn tractor engine sump filter

Part #951-12249

This item is not returnable
$6.35 | 
14% OFF Phone Price : $7.35
In Stock
Lawn & Garden Equipment Engine Starter Motor 951-12207
#9

Starter diagram

Lawn & garden equipment engine starter motor

Part #951-12207

$214.67 | 
$10.00 OFF Phone Price : $224.67
In Stock
Guide 951-12268
#150

Cylinder head diagram

Guide

Part #951-12268

This item is not returnable
$11.83
In Stock
Lawn & Garden Equipment Engine Starter Motor Front Cover 951-12208
#13

Starter diagram

Lawn & garden equipment engine starter motor front cover

Part #951-12208

This item is not returnable
$31.27 | 
14% OFF Phone Price : $36.27
In Stock
Lawn & Garden Equipment Engine Exhaust Gasket 951-12271
#160

Muffler diagram

Lawn & garden equipment engine exhaust gasket

Part #951-12271

This item is not returnable
$10.11
In Stock

RECOMMENDED MAINTENANCE PARTS AND ACCESSORIES

Repair guides for bottom-mount refrigerators

How to replace an electronic control board on the back of a refrigerator

How to replace an electronic control board on the back of a refrigerator

If your refrigerator isn't running, an electronic control board failure could be the problem. A service technician can d…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a refrigerator thermistor

How to replace a refrigerator thermistor

The thermistor senses the temperature inside the refrigerator. If the actual temperature and the temperature you set are…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace an in-door ice maker on a French door refrigerator

How to replace an in-door ice maker on a French door refrigerator

Follow these step-by-step instructions how to replace the in-door ice maker in Kenmore TRIO and LG French door refrigera…

Read more
Repair difficulty
Time required
 15 minutes or less

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

View all
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.…

Read more
What are the main components of a lawn mower?

What are the main components of a lawn mower?

Learn about the main parts of a lawn mower and when to replace parts.…

Read more

Parts & More