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Model # 4X90HU Official MTD engine

Here are the diagrams and repair parts for Official MTD 4X90HU engine, as well as links to manuals and error code tables, if available.

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

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Owner’s manual
Error Codes

Model diagram and schematic

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Showing 10 of 147 parts  |
Lawn & Garden Equipment Engine Spark Plug 951-10292
#153

Cylinder head diagram

Lawn & garden equipment engine spark plug

Part #951-10292

Replaced by #951-10292A

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Manufacturer substitution
This part replaces 951-10292. Substitute parts can look different from the original.
BEST SELLER
This item is not returnable
$5.88 | 
63% OFF MSRP : $16.00
In Stock
Lawn Tractor Air Filter 937-05066
#65

Air intake diagram

Lawn tractor air filter

Part #937-05066

BEST SELLER
This item is not returnable
$31.97 | 
14% OFF Phone Price : $36.97
In Stock
Lawn & Garden Equipment Engine Flywheel Key 951-10307
#45

Crankshaft/crankcase cover diagram

Lawn & garden equipment engine flywheel key

Part #951-10307

Replaced by #751P10307A

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Manufacturer substitution
This part replaces 951-10307. Substitute parts can look different from the original.
This item is not returnable
$3.22 | 
24% OFF Phone Price : $4.22
In Stock
Lawn & Garden Equipment Engine Throttle Linkage Spring 951-12231
#87

Crankcase diagram

Lawn & garden equipment engine throttle linkage spring

Part #951-12231

This item is not returnable
$6.47 | 
13% OFF Phone Price : $7.47
In Stock
Hook Bolt 710-05305
#148

Cylinder head diagram

Hook bolt

Part #710-05305

This item is not returnable
$6.57
In Stock
Lawn & Garden Equipment Bushing 750-05320
#3

Engine shroud diagram

Lawn & garden equipment bushing

Part #750-05320

This item is not returnable
$6.25 | 
14% OFF Phone Price : $7.25
In Stock
Lawn & Garden Equipment Engine Voltage Regulator 925-06299
#108

Starter assembly diagram

Lawn & garden equipment engine voltage regulator

Part #925-06299

$48.17 | 
9% OFF Phone Price : $53.17
In Stock
Lawn & Garden Equipment Engine Ignition Coil 994-00128
Lawn & garden equipment engine ignition coil

Part #994-00128

$109.05 | 
8% OFF Phone Price : $119.05
In Stock
Lawn & Garden Equipment Engine Fuel Line Clamp 951-11700
#24

Crankcase diagram

Lawn & garden equipment engine fuel line clamp

Part #951-11700

Replaced by #951-11700A

?
Manufacturer substitution
This part replaces 951-11700. Substitute parts can look different from the original.
This item is not returnable
$6.63
In Stock
Dipstick Assembly 924-05033
#112

Crankshaft/crankcase cover diagram

Dipstick assembly

Part #924-05033

Replaced by #924-05033A

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Manufacturer substitution
This part replaces 924-05033. Substitute parts can look different from the original.
$33.60
In Stock

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