Repair Parts Home Lawn Equipment Parts MTD Parts MTD Trimmer Parts

MTD 25A-26J7783 (2014) 159-Cc 22" Remington Wheeled Trimmer Parts

We Sell Only Genuine MTD Parts

Find Part By Symptom

Choose a symptom to view parts that fix it.

Won't start

47%

Trigger doesn't work

18%

Engine rotates but trimmer head doesn't

17%

Starter rope won't retract

11%

Starts but immediately dies

Show All Symptoms

Find Part by Symptom

Popular Parts

$3.48

$3.59

$3.56

$4.78

$3.53

Carriage Bolt 1/4-20 x .62

$3.58

TT Screw 1/4-14 x .625

$3.77

Fuel Filter

$8.49

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Questions & Answers

Hotspots

Fig #

951-1

Spark PLUG/F5RTC

$7.17

Part Number:951-14437

In Stock, 25+ available

$7.17

951-1

Air Filter Element, Paper

$16.75

Part Number:951-14632A

In Stock, 25+ available

$16.75

951-1

Fuel Cap Assembly

$12.34

Part Number:951-14407

In Stock, 18 available

$12.34

951-1

Fuel Filter

$8.49

Part Number:951-12296A

In Stock, 25+ available

Note: Furnish 951-10364, Fuel Line Kit

$8.49

954-0

V-Belt

$28.26

Part Number:954-0625A

In Stock, 25+ available

$28.26

490-0

Trim Line

$13.16

Part Number:490-040-M035

In Stock, 25+ available

$13.16

946-0

Control Cable

$19.09

Part Number:946-05141

In Stock, 25+ available

$19.09

720-0

Wing Knob

$5.73

Part Number:720-04122

In Stock, 25+ available

$5.73

734-0

Rear Wheel Assembly 14 x 1.8

$65.75

Part Number:734-1864

In Stock, 3 available

$65.75

731-2

Trail Shield Obsolete - Not Available

$22.76

Part Number:731-2329

Discontinued

SPW-1

Arnold Spark Plug Wrench Optional

$13.16

Part Number:490-850-0018

In Stock, 10 available

Note: Optional

$13.16

SPW-1

Arnold Spark Plug Wrench Optional

$13.16

Part Number:490-850-0018

In Stock, 10 available

Note: Optional

$13.16

490-8

Gas & Oil Siphon

$19.74

Part Number:490-850-0008

In Stock, 8 available

Note: Optional

$19.74

22216

Sta-Bil Fuel Stabilizer 32 Oz. Optional

$15.55

Part Number:22287

Ships in 1 - 4 business days

Note: Optional

$15.55

22208

Sta-Bil Fuel Stabilizer 8 Oz. Optional

$10.76

Part Number:22208

Ships in 1 - 4 business days

Note: Optional

$10.76

Hotspots

Fig #

114

Asm: Housing-Air

$35.17

Part Number:951-14933

In Stock, 2 available

$35.17

115

Air Filter Element, Paper

$16.75

Part Number:951-14632A

In Stock, 25+ available

$16.75

116

Nut

$5.65

Part Number:712-05015

In Stock, 13 available

Note: Without a Numeric Call-Out in Image

$5.65

800

Primer Assembly, Non-Vented

$11.77

Part Number:951-05180

In Stock, 7 available

$11.77

Hotspots

Fig #

120

Air Filter Base Gasket

$6.92

Part Number:951-14419A

In Stock, 18 available

$6.92

121

Carburetor Assembl

$88.41

Part Number:951-05232

In Stock, 7 available

$88.41

121

Carburetor Rebuil

$40.66

Part Number:951-14824

In Stock, 1 available

$40.66

122

Carburetor Gasket

$9.13

Part Number:951-14424

In Stock, 14 available

$9.13

123

Carburetor Insulator

$4.84

Part Number:951-11738

In Stock, 13 available

Note: Furnish 951-11788, Gasket Kit External

$4.84

124

Carburetor Gasket

$7.04

Part Number:951-14827

Backorder: No ETA

125

Carburetor Stud-M6 X 87

$6.19

Part Number:951-14826

Ships in 1 - 4 business days

$6.19

800

Primer Assembly, Non-Vented

$11.77

Part Number:951-05180

In Stock, 7 available

$11.77

Hotspots

Fig #

Bolt

$3.77

Part Number:710-04916

In Stock, 1 available

Note: Furnish 951-10414b, Short Block Assembly

$3.77

Breather Cover Plate

$12.35

Part Number:951-14404

Backorder: No ETA

Breather Gasket

$8.75

Part Number:951-14405

Backorder: No ETA

Upper Crankshaft Seal

$5.32

Part Number:951-11596

In Stock, 1 available

Note: Furnish 951-11789, Shortblock

$5.32

Breather Screen

$4.64

Part Number:951-11730

In Stock, 1 available

Note: Furnish 951-11789, Shortblock

$4.64

Breather Spring

$3.70

Part Number:732-04718

In Stock, 1 available

Note: Furnish 951-10414b, Short Block Assembly

$3.70

Breather Valve

$3.45

Part Number:951-11614

Backorder: No ETA

Note: Furnish 951-11789, Shortblock

Bolt M6X12

$3.74

Part Number:710-04915

Ships in 1 - 4 business days

$3.74

Throttle Linkage

$7.05

Part Number:951-14410

Backorder: No ETA

Throttle Linkage Spring

$7.43

Part Number:951-14409

In Stock, 6 available

$7.43

Governor Spring

$8.15

Part Number:951-14411

Ships in 1 - 4 business days

$8.15

Governor Arm Assembly

$7.36

Part Number:951-14412

In Stock, 1 available

$7.36

Governor Arm Bolt

$5.52

Part Number:710-04908

Ships in 1 - 4 business days

$5.52

Nut

$5.65

Part Number:712-05015

In Stock, 13 available

Note: Without a Numeric Call-Out in Image

$5.65

Component Bracket

$12.55

Part Number:951-14413

Backorder: No ETA

Air Vane Cover Plate

$5.70

Part Number:951-14605

Backorder: No ETA

Cotter Pin

$3.58

Part Number:714-04078

In Stock, 2 available

Note: Furnish 951-11059a, Gasket Kit Complete

$3.58

Governor Seal

$3.70

Part Number:951-11902

In Stock, 1 available

Note: Also Available in Kit Below

$3.70

Governor Arm Shaft

$10.98

Part Number:951-14416

Ships in 1 - 4 business days

$10.98

Breather Hose Assembly

$5.35

Part Number:951-11520

Ships in 1 - 4 business days

$5.35

Hose Clamp

$3.74

Part Number:726-04101

Backorder: No ETA

Crankcase Cover Gasket

$12.49

Part Number:951-14415

Ships in 1 - 4 business days

$12.49

Crankcase

$176.82

Part Number:951-14635

Ships in 1 - 4 business days

$176.82

Service Kit-Short

$313.68

Part Number:951-05150A

Ships in 1 - 4 business days

$313.68

Main Bearing

$29.74

Part Number:951-11369

Ships in 1 - 4 business days

Note: Also Available in Kit Below

$29.74

153

Piston Ring Set

$33.66

Part Number:951-14433

Backorder: No ETA

158

Piston Pin Snap Ring

$3.45

Part Number:951-11603

Ships in 1 - 4 business days

Note: Furnish 951-11789, Shortblock

$3.45

159

Piston

$59.49

Part Number:951-14434

Ships in 1 - 4 business days

$59.49

160

Piston Pin

$10.92

Part Number:951-14435

Ships in 1 - 4 business days

$10.92

161

Connecting Rod Assembly

$64.19

Part Number:951-14436

Ships in 1 - 4 business days

$64.19

Hotspots

Fig #

Brake Assy Bolt M6x35

$3.34

Part Number:710-04980

Ships in 1 - 4 business days

$3.34

Bolt

$3.77

Part Number:710-04916

In Stock, 1 available

Note: Furnish 951-10414b, Short Block Assembly

$3.77

Crankshaft Assembly

$182.80

Part Number:951-14417

Ships in 1 - 4 business days

$182.80

Flywheel Key

$2.99

Part Number:751P10307A

In Stock, 6 available

Note: Also Available in Kit Below

$2.99

Oil Dipstick Assembly

$15.35

Part Number:951-14440

In Stock, 8 available

$15.35

Oil Fill Tube Assembly

$16.04

Part Number:951-14441

In Stock, 25 available

$16.04

Oil Return Seal

$4.19

Part Number:951-11733

Backorder: No ETA

Note: Furnish 951-11789, Shortblock

Crankshaft Thrust Washer

$3.70

Part Number:736-04491

Ships in 1 - 4 business days

Note: Furnish 951-10414b, Short Block Assembly

$3.70

Governor Gear Mounting Plate

$4.35

Part Number:951-11609

Ships in 1 - 4 business days

Note: Furnish 951-11789, Shortblock

$4.35

Governor Gear/Shaft Assembly

$10.33

Part Number:951-11549

Backorder: No ETA

Note: Furnish 951-11789, Shortblock

Governor Cup

$4.74

Part Number:931-09595

Ships in 1 - 4 business days

$4.74

Washer 6.20.615

$4.27

Part Number:936-05038

Ships in 1 - 4 business days

$4.27

Clamp

$5.14

Part Number:916-05003

Ships in 1 - 4 business days

$5.14

105

Dowel Pin 9 X 14

$3.58

Part Number:715-04096A

In Stock, 1 available

$3.58

106

Dowel Pin 9 X 14

$3.58

Part Number:715-04096A

In Stock, 1 available

$3.58

108

Oil Drain Plug Washer

$5.87

Part Number:736-04440

In Stock, 2 available

Note: Also Available in Kit Below

$5.87

109

Oil Drain Plug

$5.72

Part Number:710-04906

In Stock, 8 available

Note: Also Available in Kit Below

$5.72

110

Crankcase Cover

$87.31

Part Number:951-14418

Ships in 1 - 4 business days

$87.31

111

Lower Crankshaft Seal

$8.86

Part Number:951-11545A

Backorder: No ETA

Note: Furnish 951-11770, Gasket Kit Complete

Hotspots

Fig #

Bolt

$3.77

Part Number:710-04916

In Stock, 1 available

Note: Furnish 951-10414b, Short Block Assembly

$3.77

116

Nut

$5.65

Part Number:712-05015

In Stock, 13 available

Note: Without a Numeric Call-Out in Image

$5.65

126

Cylinder Head

$106.08

Part Number:951-14639

Ships in 1 - 4 business days

$106.08

127

Bolt-M8 X 54 Cylin

$5.75

Part Number:910-06185

Ships in 1 - 4 business days

$5.75

128

Spark PLUG/F5RTC

$7.17

Part Number:951-14437

In Stock, 25+ available

$7.17

130

Intake Valve Seal

$7.04

Part Number:921-04237A

Ships in 1 - 4 business days

$7.04

132

Valve Spring

$2.99

Part Number:751P12004A

Ships in 1 - 4 business days

$2.99

133

Valve Spring Retainer

$3.52

Part Number:951-11977

In Stock, 2 available

$3.52

134

Push Rod Guide

$6.43

Part Number:951-11687

In Stock, 1 available

Note: Furnish 951-11746, Cylinder Head Assembly

$6.43

135

Rocker Arm Assembly

$34.49

Part Number:951-11606

Ships in 1 - 4 business days

$34.49

136

Rocker Arm Stud

$5.81

Part Number:710-04902

In Stock, 11 available

Note: Also Available in Kit Below

$5.81

137

Rocker Arm

$6.49

Part Number:951-12001

In Stock, 1 available

$6.49

138

Valve Adjusting Nut

$8.88

Part Number:751-11123

Ships in 1 - 4 business days

Note: Also Available in Kit Below

$8.88

139

Jam Nut

$8.00

Part Number:751-11124

Backorder: No ETA

Note: Also Available in Kit Below

140

Valve Cover Gasket

$8.93

Part Number:951-11551

In Stock, 2 available

Note: Furnish 951-11772, Gasket Kit External

$8.93

141

Valve Cover

$14.09

Part Number:951-14609

Ships in 1 - 4 business days

$14.09

142

Muffler Stud M6X95

$3.70

Part Number:710-05094

In Stock, 2 available

Note: Furnish 951-10342, Muffler Stud Assembly

$3.70

143

Gasket-Muffler

$6.24

Part Number:951-14427A

Backorder: No ETA

144

Muffler Assembly

$70.78

Part Number:951-10403

Backorder: No ETA

145

Muffler Shield

$21.87

Part Number:951-15072

Backorder: No ETA

146

Spark Arrestor

$39.93

Part Number:951-10351A

In Stock, 1 available

$39.93

147

Spark Arrestor Screw

$3.57

Part Number:710-04983

Ships in 1 - 4 business days

$3.57

148

Cylinder Head Gasket

$14.11

Part Number:951-14431

Ships in 1 - 4 business days

$14.11

149

Cylinder Head Dowel 10X16

$3.57

Part Number:715-04108

In Stock, 1 available

Note: Also Available in Kit Below

$3.57

150

Push Rod

$5.35

Part Number:747-04862

In Stock, 2 available

$5.35

151

Tappet

$8.88

Part Number:951-14432

Ships in 1 - 4 business days

$8.88

152

Camshaft Assembly

$56.65

Part Number:951-11741

Ships in 1 - 4 business days

Note: Furnish 951-11789, Shortblock

$56.65

Hotspots

Fig #

Recoil Starter Assembly

$81.56

Part Number:951-14396

In Stock, 23 available

$81.56

Starter Acorn Nut

$5.27

Part Number:712-04276

Ships in 1 - 4 business days

$5.27

Starter Handle

$8.92

Part Number:731-07925

Backorder: No ETA

Note: (Not Shown)

Starter/Shroud Rear Stud M678.5

$8.46

Part Number:951-14397

Backorder: No ETA

Starter/Shroud Front Stud M674

$8.46

Part Number:951-14398

Backorder: No ETA

Engine Shroud

$43.07

Part Number:951-14399

Ships in 1 - 4 business days

$43.07

Engine Shroud Spacer

$3.48

Part Number:750-05320

Backorder: No ETA

Carbon Canister Assembly

$51.25

Part Number:951-14442

Ships in 1 - 4 business days

$51.25

Carbon Canister

$27.28

Part Number:951-14126

Ships in 1 - 4 business days

$27.28

Carbon Canister Filter

$12.31

Part Number:951-14400

Backorder: No ETA

Carbon Canister Filter Cap

$6.15

Part Number:951-14127

Backorder: No ETA

Flywheel Nut M14

$6.00

Part Number:712-04287

In Stock, 1 available

$6.00

Flywheel

$100.85

Part Number:951-14401A

Ships in 1 - 4 business days

$100.85

Brake Assembly

$34.20

Part Number:951-14402

Ships in 1 - 4 business days

$34.20

Brake Arm Nut

$5.22

Part Number:712-04219

Ships in 1 - 4 business days

$5.22

Brake Spacer

$3.57

Part Number:750-05384

Ships in 1 - 4 business days

$3.57

Brake Assy Bolt M6x35

$3.34

Part Number:710-04980

Ships in 1 - 4 business days

$3.34

Flange Bolt

$3.48

Part Number:710-04918

Ships in 1 - 4 business days

$3.48

Ignition Coil Assembly

$96.75

Part Number:951-14403

Ships in 1 - 4 business days

$96.75

Hotspots

Fig #

Bolt

$3.77

Part Number:710-04916

In Stock, 1 available

Note: Furnish 951-10414b, Short Block Assembly

$3.77

Fuel Tank Lower Grommet

$7.05

Part Number:731-08133

In Stock, 1 available

$7.05

Fuel Tank Upper Grommet

$10.67

Part Number:951-14406

In Stock, 1 available

$10.67

Fuel Tank Nut

$6.24

Part Number:731-08104

Ships in 1 - 4 business days

$6.24

Fuel Cap Assembly

$12.34

Part Number:951-14407

In Stock, 18 available

$12.34

Fuel Cap Tether

$5.46

Part Number:951-14695

Backorder: No ETA

Fuel Tank

$59.77

Part Number:931-04629

In Stock, 7 available

$59.77

Bolt M6X12

$3.74

Part Number:710-04915

Ships in 1 - 4 business days

$3.74

Flexible Clamp

$3.53

Part Number:951-11680

Ships in 1 - 4 business days

$3.53

Fuel Filter

$8.49

Part Number:951-12296A

In Stock, 25+ available

Note: Furnish 951-10364, Fuel Line Kit

$8.49

Hose Clamp-Carb

$3.52

Part Number:951-11700A

Ships in 1 - 4 business days

$3.52

Fuel Hose

$23.18

Part Number:951-14438

In Stock, 2 available

$23.18

Plastic Support Clamp

$3.34

Part Number:723-04071

Backorder: No ETA

Hotspots

Fig #

Spindle Assembly, includes 782-0143 Obsolete - Not Available

$217.74

Part Number:918-0558A

Discontinued

Note: Spindle Assembly, Includes 782-0143

Trimmer Deflector Assembly

$99.78

Part Number:631-0096

Ships in 1 - 4 business days

Note: (Incl. Deflector Flap and Hardware) - Incl. Deflector Flap and Hardware

$99.78

Axle Asm-Trimmer

$49.96

Part Number:681P0159A

Ships in 1 - 4 business days

$49.96

Idler Bracket Assembly

$41.85

Part Number:981-1008A

In Stock, 3 available

$41.85

Trimmer Base

$141.14

Part Number:781-05007A-0691

Ships in 1 - 4 business days

$141.14

Hex HD. Screw 5/16-24 x 5/8

$3.84

Part Number:710-0237

Ships in 1 - 4 business days

Note: Tightening Torque: 150-300 In. Lbs.

$3.84

Carriage Bolt 1/4-20 x .62

$3.58

Part Number:710-0703

In Stock, 25+ available

Note: Purchase Locally

$3.58

TT Screw 1/4-14 x .625

$3.77

Part Number:710-1652

In Stock, 12 available

Note: If Equipped

$3.77

Hex Bolt 1/4-20 x /75

$3.57

Part Number:710-3015

In Stock, 3 available

Note: Used on Briggs and Stratton Engines Only

$3.57

Locking Flange Nut

$3.48

Part Number:712-04063

In Stock, 25+ available

Note: Use With 618-04378a Transmission, Double "D" Input Shaft

$3.48

Flange Lock Nut

$3.56

Part Number:712-04064

In Stock, 25+ available

Note: Models Without Clutch Lock

$3.56

Rear Wheel Assembly 14 x 1.8

$65.75

Part Number:734-1864

In Stock, 3 available

$65.75

Trail Shield Obsolete - Not Available

$22.76

Part Number:731-2329

Discontinued

Extension Spring

$3.87

Part Number:732-1022

In Stock, 25+ available

$3.87

Fl-Wash. .28\\\" I.D. X .75\\\" O.D. X .06

$3.68

Part Number:736-0173

In Stock, 7 available

Note: Used With Manual Pto

$3.68

Wave Washer .500 ID x 1.0 OD

$3.81

Part Number:736-0182

In Stock, 10 available

Note: If Equipped

$3.81

Bell-Wash. 1/4 I.D.

$3.54

Part Number:736-0270

In Stock, 21 available

Note: If Equipped

$3.54

Washer Flat .343 X .880 X .062

$3.85

Part Number:736-0371

In Stock, 1 available

Note: Washer 7/16" X 7/8" X .060

$3.85

Bell-Wash. .325

$3.87

Part Number:736-0425

Ships in 1 - 4 business days

Note: Optional

$3.87

Flap, Deflector, String Trimmer

$16.32

Part Number:731-2315

Backorder: No ETA

Trim Line

$13.16

Part Number:490-040-M035

In Stock, 25+ available

Note: 10-pack

$13.16

Spacer

$10.06

Part Number:948-0278

In Stock, 2 available

Note: for Models 1463834h & 146w834p Only

$10.06

Spacer.51 ID x 1.0 OD

$3.08

Part Number:750-1240

Backorder: No ETA

Idler Spacer

$5.22

Part Number:750-1275

In Stock, 2 available

$5.22

V-Belt

$28.26

Part Number:954-0625A

In Stock, 25+ available

$28.26

Idler Pulley

$48.19

Part Number:756-1198

In Stock, 4 available

$48.19

Belt Keeper Bracket

$24.58

Part Number:781-1020-0637

In Stock, 2 available

$24.58

Idler Keeper Bracket Obsolete - Not Available

$7.27

Part Number:781-1028

Discontinued

Hinge Clip Obsolete - Not Available

$3.76

Part Number:782-9065

Discontinued

Pan Phillips Screw, #12-16 x .625

$3.29

Part Number:710-1823

Ships in 1 - 4 business days

$3.29

Flat Washer

$4.45

Part Number:736-0400

In Stock, 2 available

$4.45

Pulley/Flywheel

$91.01

Part Number:656-05000

Ships in 1 - 4 business days

$91.01

TT Sems Screw 3/8-16 X 1.0

$3.66

Part Number:710-0654A

In Stock, 14 available

Note: Code 665

$3.66

Hex Screw, 3/8-24, 1.25, Gr8

$3.62

Part Number:710-06074

In Stock, 1 available

$3.62

Cover, Shroud

$12.75

Part Number:731-09688

In Stock, 2 available

$12.75

Washer-Bell

$3.95

Part Number:736-0452

In Stock, 7 available

$3.95

Handle Knob

$3.84

Part Number:720-0279

In Stock, 25+ available

Note: New Part

$3.84

Carriage Screw

$4.78

Part Number:710-04998

In Stock, 25+ available

$4.78

Rope Guide

$3.45

Part Number:710-1205

In Stock, 25+ available

Note: (Model 959 Only)

$3.45

Hex Cap Screw 3/8-16 x 1.25

$3.53

Part Number:710-3005

In Stock, 18 available

Note: Purchase Locally

$3.53

Flanged Lock Nut

$3.59

Part Number:712-04065

In Stock, 25+ available

Note: (Not Shown)

$3.59

Wing Knob

$5.73

Part Number:720-04122

In Stock, 25+ available

$5.73

Shoulder Screw

$3.53

Part Number:738-04419A

In Stock, 25+ available

$3.53

Control Cable

$19.09

Part Number:946-05141

In Stock, 25+ available

$19.09

Bail, Black

$12.75

Part Number:747-06246-0637

In Stock, 14 available

$12.75

Handle, Lower

$10.91

Part Number:749-05102-0637

In Stock, 3 available

$10.91

Handle, Upper

$38.21

Part Number:749-05103-0637

Ships in 1 - 4 business days

$38.21

800

Safety Goggles

$22.65

Part Number:723-0400

Ships in 1 - 4 business days

Note: (Not Shown)

$22.65

Hotspots

Fig #

777S3

Label-Wheel Stringer Danger Obsolete - Not Available

$4.38

Part Number:777S35316

Discontinued

777S3

Label-Wheel String Trimmer Wrng

$5.46

Part Number:777S35303

Backorder: No ETA

777D1

Label-Remington 22In. Obsolete - Not Available

$4.38

Part Number:777D19171

Discontinued

Fig #

Trimmer Parts

Repair Guides

How to Replace the Fuel Filters in Your Outdoor Power Equipment

This video will help you troubleshoot your fuel-line replacement repairs.

How to Test a Small Engine for Spark

If your small engine isn't starting, you'll need to diagnose many issues including the spark plug. This video walks you through the steps of how to test for a spark using a spark tester.

Quick Fix: How to Clean a Spark Arrestor Screen on a Small 2-Cycle Engine

This repair video will instruct you how to repair a dirty or damaged spark arrestor on your small engine.

Quick Fix: How to Replace the Spark Plug in a Small Engine

This video will help you replace the spark plug on a small engine which will help get your gas powered equipment up and running again.

Accessories

Accessories for the MTD 25A-26J7783

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Question: Red Gas Pump Replament

TxTallUser

Hello I keep my mower outside. I know I know
the red gas primer is about to crack away. is there a replacement part for this.

walk behind Discussion for the MTD 25A-26J7783 (2014) 159-Cc 22" Remington

Hello TxTallUser Those bulbs do not last forever. These bulbs pump a small blast of air INTO the carb float bowl, they do NOT pump gas. It splashes up into the emulsion tube enriching the fuel /air mixture for an easier start up. Yes, there are replacements for them. But....we need to know the make and model no. of the engine that this carburetor with the red primer bulb is mounted to. Is it a Briggs engine? Is it a Tecumseh engine? I will input your info to try and tell. OK...the Primer Assembly for your wheeled trimmer has been discontinued, but that does NOT mean there is not one available from somewhere else. They just do not have one for sale on THIS site:

http://www.ereplacementparts.com/primer-assembly-nonvented-p-2264200.html

The part number is MTD 951-05180 We will just have to look around on the Internet to possibly find one. I know there are tons of red primer bulbs on ebay. I have bought them on there myself for a Tecumseh carb and a Briggs carb. I do not know exactly what carburetor you have yet, but will input info for the primer assembly. The primer assembly on your machine is part of the air box, not part of the carburetor. Some older carbs have the red primer bulb on the side of the carburetor, not on the airbox that bolts TO the carburetor. Some of these are quite older actually.

Here is one for sale from another vendor. There are others as well. A Google Search stating (MTD 951-05180) yielded many sellers.
link removed

You have no idea the hundreds of times I have done this to give folks like yourself information on where they can obtain the part. All I do is utilize the Google Search feature and input the make and part number of what they want. In your case....MTD 951-05180. The part number was acquired from the Parts List diagram on this website.