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MTD
Gas Line Trimmer

Model # YM90BC Official MTD trimmer

Here are the diagrams and repair parts for Official MTD YM90BC trimmer, as well as links to manuals and error code tables, if available.

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  • 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”.

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

Owner’s manual

Model diagram and schematic

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ALL PARTS
Showing 10 of 101 parts  |
Yard Machines Line Trimmer Fuel Line (replaces 791-180243, 791-181168, 791-182495) 791-181086
#18

Cylinder/flywheel/fuel tank diagram

Yard machines line trimmer fuel line (replaces 791-180243, 791-181168, 791-182495)

Part #791-181086

$10.88 | 
16% OFF Phone Price : $12.88
In Stock
Yard Machines Lawn & Garden Equipment Engine Air Filter 791-180350B
#2

Cylinder/flywheel/fuel tank diagram

Yard machines lawn & garden equipment engine air filter

Part #791-180350B

This item is not returnable
$13.02 | 
13% OFF Phone Price : $15.02
In Stock
Kmart Line Trimmer Drive Shaft Coupler (replaces 753-08212, 791-160511, 791-181616b) 753-1190
#17

Shield/handle/shaft diagram

Kmart line trimmer drive shaft coupler (replaces 753-08212, 791-160511, 791-181616b)

Part #753-1190

This item is not returnable
$31.62 | 
16% OFF Phone Price : $37.62
In Stock
Kmart Line Trimmer Drive Shaft Housing, Upper (replaces 753-05834, 769-04236) 753-04236
#8

Shield/handle/shaft diagram

Kmart line trimmer drive shaft housing, upper (replaces 753-05834, 769-04236)

Part #753-04236

$102.49 | 
10% OFF Phone Price : $114.49
In Stock
Line Trimmer Throttle Trigger Spring (replaces 732-04270, 732-04270a, 753-04992) 753-05007
#3

Shield/handle/shaft diagram

Line trimmer throttle trigger spring (replaces 732-04270, 732-04270a, 753-04992)

Part #753-05007

This item is not returnable
$7.77 | 
11% OFF Phone Price : $8.77
In Stock
Troybilt Line Trimmer Cutting Blade (replaces 791-145873) 791-145873B
#41

Shield/handle/shaft diagram

Troybilt line trimmer cutting blade (replaces 791-145873)

Part #791-145873B

Get free shipping with Automatic Reorder

$57.59 | 
9% OFF Phone Price : $63.59
In Stock
Yard-man Lawn & Garden Equipment Engine Fuel Tank Cap 791-182529
#17

Cylinder/flywheel/fuel tank diagram

Yard-man lawn & garden equipment engine fuel tank cap

Part #791-182529

This item is not returnable
$28.71 | 
17% OFF Phone Price : $34.71
In Stock
Muffler Screw 753-04620
#48

Cylinder/flywheel/fuel tank diagram

Muffler screw

Part #753-04620

Replaced by #710-04188A

?
Manufacturer substitution
This part replaces 753-04620. Substitute parts can look different from the original.
This item is not returnable
$6.35 | 
14% OFF Phone Price : $7.35
In Stock
Spacer Nut 791-180217
#41

Cylinder/flywheel/fuel tank diagram

Spacer nut

Part #791-180217

Replaced by #712-0161

?
Manufacturer substitution
This part replaces 791-180217. Substitute parts can look different from the original.
This item is not returnable
$5.64 | 
15% OFF Phone Price : $6.64
In Stock
Starter Handle 791-181079
#28

Cylinder/flywheel/fuel tank diagram

Starter handle

Part #791-181079

Replaced by #631-04164B

?
Manufacturer substitution
This part replaces 791-181079. Substitute parts can look different from the original.
This item is not returnable
$6.19 | 
14% OFF Phone Price : $7.19
In Stock

Symptoms for gas line trimmers

Choose a symptom to see related grass line trimmer repairs.

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Why won't my gas line trimmer start?

Main causes: stale fuel, cracked fuel lines, dirty carburetor, bad spark plug, worn piston rings…

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Why does my gas line trimmer run rough?

Main causes: stale fuel, clogged fuel filter, faulty spark plug, clogged air filter, cracked fuel lines, clogged carbure…

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Why does my gas line trimmer leak gas?

Main causes: cracked fuel lines, bad carburetor seals, leaky fuel tank cap, damaged fuel tank…

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Repair guides for gas line trimmers

These step-by-step repair guides will help you safely fix what’s broken on your grass line trimmer.

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How to rebuild a line trimmer carburetor

How to rebuild a line trimmer carburetor

If the line trimmer engine won't start even though there's fuel in the tank, the carburetor could be the problem. Follow…

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer carburetor

How to replace a line trimmer carburetor

If the line trimmer won't start even though there's fuel in the tank, the carburetor could be the problem. Follow these …

Read more
Repair difficulty
Time required
 15 minutes or less
How to replace a line trimmer fuel line

How to replace a line trimmer fuel line

The fuel line on a grass line trimmer deteriorates with time and eventually can split or crack. You can replace it yours…

Read more
Repair difficulty
Time required
 15 minutes or less

Articles and videos for gas line trimmers

Use the advice and tips in these articles and videos to get the most out of your grass line trimmer.

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Top 10 electric lawn and garden tools for 2023

Learn about the top 10 must-have electric lawn & garden tools for 2023…

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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.…

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Grass line trimmer maintenance checklist

Grass line trimmer maintenance checklist

Find out how to take care of your grass line trimmer from the start of the trimming season until the end, with this help…

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