Craftsman M125 - User Manual

Questions and Answers

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Richard SharpAug 12, 2025
Why won't my Craftsman M125 Lawn Mower start?
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  Mr. Vincent GrahamAug 12, 2025
  If your Craftsman Lawn Mower engine won't start, several factors could be at play. First, make sure the blade control is engaged. Next, check that the spark plug boot is connected securely. An empty or stale fuel tank can also prevent starting, so fill it with clean, fresh gasoline. If your mower has a primer, use it as instructed. A faulty spark plug might be the culprit, requiring cleaning, gap adjustment, or replacement. In case the engine is flooded, wait a few minutes before attempting to restart. Finally, a blocked fuel line can cause starting issues; contact a Parts & Repair Center to have it cleaned.
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John GreeneAug 15, 2025
Why does my Craftsman M125 have an uneven cut?
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  Alexis JacksonAug 15, 2025
  If your Craftsman Lawn Mower is providing an uneven cut, ensure the wheels are positioned correctly by adjusting the cutting height lever on the right front and right rear wheels to the same position. Also, a dull blade can cause an uneven cut, so sharpen or replace it.
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Jose ReynoldsAug 19, 2025
Why does my Craftsman Lawn Mower engine run erratic?
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  Jeffrey PaulAug 19, 2025
  If your Craftsman Lawn Mower engine is running erratically, start by checking the spark plug boot to ensure it is tightly connected. Stale fuel can also cause this issue, so replace it with fresh gasoline. Make sure the vent in the gas cap isn't plugged; clear it if necessary. Water or dirt in the fuel system could be the problem; run the engine until it stops from lack of fuel, then refill with fresh fuel. If the air cleaner is dirty, refer to the Engine Manual for Air Cleaner Maintenance. A blocked fuel line might also be the cause; contact a Parts & Repair Center to have the fuel line cleaned.
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Jeffrey HardingAug 23, 2025
What to do if my Craftsman Lawn Mower will not mulch grass?
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  tracymillerAug 23, 2025
  If your Craftsman Lawn Mower is not mulching grass effectively, it might be due to wet or excessively high grass or a dull blade. Avoid mowing when the grass is wet; wait until it's dry. If the grass is too high, mow it first at a high setting, then mow again at the desired height, or reduce the cutting path width. If the blade is dull, sharpen or replace it.
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Joshua HayesAug 27, 2025
Why is my Craftsman Lawn Mower engine overheating?
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  Antonio NelsonAug 27, 2025
  If your Craftsman Lawn Mower engine is overheating, check the engine oil level and fill the crankcase with the correct oil if it's low. Also, ensure that airflow isn't restricted by cleaning the area around and on top of the engine.
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Charles JacksonAug 31, 2025
Why is my Craftsman M125 vibrating so much?
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  Frances ContrerasAug 31, 2025
  If your Craftsman Lawn Mower is vibrating excessively, it could be due to a loose or unbalanced cutting blade. Tighten the blade and adapter, and balance the blade. Alternatively, the cutting blade might be bent, in which case you should replace it.
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Robert CameronSep 3, 2025
Why does my Craftsman M125 Lawn Mower idle poorly?
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  Christine BlairSep 4, 2025
  If your Craftsman Lawn Mower idles poorly, the spark plug may be fouled, faulty, or have a gap that is too wide. Reset the gap or replace the spark plug. If the air cleaner is dirty, refer to Air Cleaner Maintenance in the Engine Manual.
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Molly CastilloSep 7, 2025
What causes occasional skips in Craftsman M125 Lawn Mower?
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  Elizabeth ThompsonSep 7, 2025
  If your Craftsman Lawn Mower occasionally skips or hesitates, the spark plug gap might be too close. Adjust the gap, referring to the Spark Plug Maintenance section in the Engine Manual.

Summary

Safety Instructions

General Operation

Read, understand, and follow all instructions for safe machine operation.

Slope Operation

Guidance for safe mowing on slopes, including angle limits and turning.

Children

Instructions on keeping children safe around the mower.

Do Not Modify Engine

Safety Symbols

Service and Maintenance

Safe Handling of Gasoline

Precautions for handling gasoline to prevent fire and explosion hazards.

Maintenance Schedule

Schedule for regular maintenance tasks based on usage intervals.

Engine Maintenance

Blade Care

Procedures for inspecting, sharpening, balancing, and replacing the cutting blade.

Off-Season Storage

Preparing The Engine

Steps to prepare the engine for storage exceeding 30 days to prevent fuel issues.

Preparing The Lawn Mower

Troubleshooting

Engine Fails to Start

Troubleshooting steps for when the engine fails to start.

Engine Runs Erratic

Engine Overheats

Excessive Vibration

Craftsman M125 Specifications

General

Cutting Width	21 inches
Cutting Height	1.25 - 3.75 inches
Cutting Height Positions	6
Deck Material	Steel
Rear Bag Capacity	1.9 bushels
Drive Type	Push
Discharge Options	Side discharge, rear bag, mulching