I have used the ngk spark plug versions specifically for my 750 Virago as well as these Autolites as recommended by several Yamaha groups and forums. My bike still fouls the spark plugs (a few) but seems like I'm getting more miles between changes with AP63 spark plugs. I also take out the spark plugs (and clean them with brake cleaner and a small brush) which seems to extend life as well. However, I believe you need to find the best fork for your riding. AP63 works very well for me. I recommend these forks and they were a great price.
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