Getting to the spark plugs on a bike can be a time-consuming job. With modern machines having overhead cams, the plugs tend to be buried down inside the cylinder heads, so it’s often necessary to remove the fuel tank and airbox.
Some corrosion might be visible on the outside of the plug, where water has got in (usually due to over-aggressive washing), but some bikes – like some KTM's and BMW's – have drain holes to allow the majority of the water to flow away. While plugs only generally need changing after a certain mileage – rather than time – if your bike isn’t getting used a lot, it’s worth keeping an eye on them for more severe corrosion.
Valve clearance checks and spark plug replacement will likely fall on the same service, as getting to this area is so labour-intensive.
Spark plug inspection and replacement is often different between manufacturers and the frequency is detailed in your model maintenance
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