Exposing my ignorance here but...my Mk2 has started to ping rather badly. I've just recently replaced the frying pan air filter with some sports filters. The appearance of the pinging and the air fliter change might have been coincidental. I notice in the manual they advise different amounts of advance when setting the timing for different air filters - the oil air filter as opposed to the paper one. Would my changing to the sports filters mean I need to change the ignition timing?
GrahamL