no need for a diagram
take a photo before you start doing the work
you may have to take of plastic covering to see all the plug leads
if the plugs are deep in the motor in plug tubes
you use the plug lead long part to clip onto the undone plug and pull it out
best do one plug at a time
pull of the plug lead / undo spark plug / fit new spark plug
replace lead
repeat till all plugs are changed
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