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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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ALL PARTS
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 | 
15% OFF Phone Price : $6.88
Back Order
Lawn & Garden Equipment Engine Oil Filter 951-12690
#64

Crankshaft/crankcase cover diagram

Lawn & garden equipment engine oil filter

Part #951-12690

Replaced by #490-201-Y010

?
Manufacturer substitution
This part replaces 951-12690. Substitute parts can look different from the original.
BEST SELLER
$16.48 | 
11% OFF Phone Price : $18.48
In Stock
Mtd Lawn Tractor Air Filter 937-05066
#65

Air intake diagram

Mtd lawn tractor air filter

Part #937-05066

This item is not returnable
$29.18 | 
17% OFF Phone Price : $35.18
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

?
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 Tractor Engine Oil Drain Plug (replaces 710-05311) 951-11644
#88

Crankcase diagram

Lawn tractor engine oil drain plug (replaces 710-05311)

Part #951-11644

This item is not returnable
$15.69 | 
11% OFF Phone Price : $17.69
In Stock
Stud 710-06319
#82

Air intake diagram

Stud

Part #710-06319

$10.83
In Stock
Mtd Lawn & Garden Equipment Engine Electric Starter 925-06300
#109

Starter assembly diagram

Mtd lawn & garden equipment engine electric starter

Part #925-06300

$255.24 | 
$12.00 OFF Phone Price : $267.24
In Stock
Mtd Lawn & Garden Equipment Engine Voltage Regulator 925-06299
#108

Starter assembly diagram

Mtd lawn & garden equipment engine voltage regulator

Part #925-06299

$48.17 | 
11% OFF Phone Price : $54.17
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
Plug 951-14091
#23

Crankcase diagram

Plug

Part #951-14091

$8.09
In Stock

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