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How to Replace Spark Plugs on a Craftsman 6.5 HP Lawn Mower

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spark plug image by Yali Shi from Fotolia.com

Craftsman recommends changing the spark plug on their 6.5 HP mowers every 25 hours or the beginning of each mowing season. They also recommend using the Champion RJ19LM spark plug when replacing the plug. Adjust the gap between the insulator and electrode with a gap tool. The simplest method is to use a disc gap tool with graduated gap measurements. Insert the gap tool between the electrode and insulator to the necessary gap range and bend the electrode up or down to meet the tool.

Place your Craftsman lawn mower on level ground. Grab the spark plug wire boot with your fingers and twist counter-clockwise, then pull the spark plug wire boot off the spark plug. The twisting motion will break any seal created by heat.

  • Craftsman recommends changing the spark plug on their 6.5 HP mowers every 25 hours or the beginning of each mowing season.
  • Insert the gap tool between the electrode and insulator to the necessary gap range and bend the electrode up or down to meet the tool.

Remove the spark plug with a socket wrench. Check and adjust the gap on the new spark plug to .030 with a gap tool. You can purchase a simple round gap tool when you purchase the spark plug.

Thread the new spark plug into the engine crankcase and tighten the spark plug with a socket wrench. Place the spark plug wire boot over the plug and push in with your thumb until the boot locks over the plug.

Start A Craftsman 6.75 Lawn Mower

When your Craftsman lawn mower won't start, you might get very frustrated. You need all three for a lawn mower engine to run smoothly. Open the gas tank, and make sure it is full. Examine the inside of the filter. If it is very dirty, the engine won't be getting enough air, and it won't start. install a new air filter; it is not expensive. If this base is oily, replace the spark plug. Screw the spark plug back in until it is snug, but not so tight that it will strip the engine-block threads. Place the spark-plug cap back on top of the spark plug. Squeeze the choke bar to the base of the handlebars with one hand. Pull the rope quickly toward your shoulder repeatedly until the mower starts.

  • Remove the spark plug with a socket wrench.
  • Check and adjust the gap on the new spark plug to .030 with a gap tool.

Tip

You can purchase spark plugs at auto parts stores.

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