15-05-2021, 10:25 AM
Just had same problem with my RN. Had fairly new NGK plugs (say 500 mls). Engine been in and out of garage for me to alter garage wall when last week quite rough and no power. One plug was not functioning. Replaced with brand new NGK and now OK. Is there a quality control problem with NGK. I think they were purchased from Green Spark plug co.