Yamaha mostly uses D.I.D. as factory chains, don't know which one(aka VM2,ect..) and I think SunStar sprockets. I mostly get D.I.D. as well (VM2 gold)X-ring if possible. Never even considered a non-o-ring chain, pointless unless it would be a low hp sunday, good weather only, bare asphalt , putt-putt bike.
I replace the front sprocket as soon as I see any wear on the teeth that can be seen looking closely. The chain will last 2x longer if always run on good sprockets. I sell my old chains to local cheapo's for $15-$20, They can't believe I'd replace a chain before it breaks. I then laugh when down the road they complain about having to fix a case from a broken chain. They can't understand why it happens.
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