Ignition Coil to Flywheel Gap: What's the Ideal Distance?

what is the gap between ignition coil and flywheel

What is the Gap Between Ignition Coil and Flywheel

The gap between the ignition coil and flywheel is a critical measurement in small engines, such as those found in lawn mowers, chain saws, and generators. This gap, also known as the ignition coil gap or spark gap, is the distance between the ignition coil and the flywheel's magnet. The correct gap is essential for proper engine performance, as it affects the spark timing and engine combustion.

Why is the Gap Important?

The gap between the ignition coil and flywheel is crucial because it determines the strength and timing of the spark. If the gap is too small, the spark may be too weak, leading to poor engine performance, misfires, and decreased power output. On the other hand, if the gap is too large, the spark may be too strong, causing engine knock or pinging. A gap that is too large can also lead to premature wear on the ignition coil and flywheel.

Typical Gap Measurements

The typical gap measurement between the ignition coil and flywheel varies depending on the engine manufacturer and model. Here are some common gap measurements:

• Small engines (e.g., lawn mowers, chain saws): 0.010" to 0.020" (0.25 mm to 0.5 mm)
• Medium engines (e.g., generators, pressure washers): 0.015" to 0.030" (0.38 mm to 0.76 mm)
• Large engines (e.g., industrial equipment): 0.020" to 0.040" (0.5 mm to 1.0 mm)

It's essential to consult the engine manufacturer's specifications for the recommended gap measurement, as incorrect gaps can lead to engine problems.

Measuring the gap between the ignition coil and flywheel requires a feeler gauge or a spark tester. It's a relatively simple process, but it's crucial to ensure accurate measurements to maintain optimal engine performance.