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Home›Repair guides›Magnum›Checking the Engine Spark Plug

Magnum MLT4000S — Checking the Engine Spark Plug

Adjustments

For the Magnum MLT4000S, from the Magnum operator's manual.

Applies to: Magnum MLT4000S, Generac GN-220 engine

Before you start

  • Do not blast the spark plug to clean.

Parts for this job

Part numbers from the service-parts list for Magnum MLT4000S. Verify against your serial number before ordering; some links are affiliate links.

Procedure

  1. Clean the area around the base of the spark plug to keep dirt and debris out of the engine; remove the spark plug and check condition.
  2. Clean the spark plug by scraping or washing using a wire brush and commercial solvent; do not blast to clean.
  3. Check the spark plug gap using a wire feeler gauge.
  4. Adjust the gap to 0.030 inch (0.76 mm) by carefully bending the ground electrode.

Tools required

Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.

Specs & values

  • Spark plug gap 0.030 inch (0.76 mm)

Full service-parts list: Magnum MLT4000S →

Source: Magnum operator's manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.

More Magnum repair guides →