| St4s spark plugs question
This might be a silly question,but here goes....
Done the cam-belts today, but my spark plugs are a little worse for wear,
anyone have a recommendation for a slightly 'hotter' grade plug than the standard 'Champion RA59GC' ?
Judging by the colour of the plugs that came out, my engine is running on the 'cool' side (black and sooty).
Pete |