* 0.020 inch (0.5 mm) for most models
* 0.030 inch (0.7 mm) for some older models
It's a good idea to consult your engine's service manual or repair guide for the exact air gap specification for your particular model. The air gap is important for ensuring that the coil generates a strong enough magnetic field to produce a spark at the spark plug. If the air gap is too large, the spark may be weak or intermittent, causing engine performance problems.
