DIY / Household

LAWN MOWER SPARK PLUG GAP

Quick, reliable tutorials for common maintenance jobs: spark plug gaps, air filter cleaning, oil changes and more. Short steps, clear results — the way you actually do it at home.

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Most Common Cause

Wet / Low Air

Quick Win

Replace Tip/Electrode

Torch

PT-31 / SG-55

Verdict

90% of no-arc issues are air, ground, or worn consumables — easy checks first.
Keep air dry and at the right flow; moisture kills arc stability and tips.
Ground clamp on clean metal, close to the cut; inspect cable for heat damage.
Confirm torch safety interlocks and cup seating; replace cheap tips more often.

Key Specs / Setup

Recommended Air	5–6 CFM @ 90 PSI (dry, filtered)
Tip Gap	1–2 mm with standoff guide for cleaner kerf
Leads	Keep short & undamaged; check ground clamp jaws
Common Torches	PT-31, SG-55, P-80

FAQ

What’s the correct lawn-mower spark-plug gap?

Typically 0.028–0.031 in (0.70–0.80 mm); check your model.

How often should I clean a mower air filter?rc — which is better?

Inspect every 10–15 hours; foam filters can be washed, paper filters replaced.

What oil does my small engine take?

Usually SAE 30 or 10W-30; check manual and fill to dipstick mark.

DIY / Household

Troubleshooting

Alternatives

Budget 40A Cutter

Good for 6-8 mm plate

Higher Duty 60A

Better for 10-12 mm continues

Pilot Arc Bundle

Includes SG-55 torch + spares

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