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  1. R

    Which Rotella for my bike?

    This is for the Yamaha Roadstar 1700cc air cooled V-Twin and I have three choices available to me, but none are ideal. So which would you use? First, due to the flat tappet cams, I need an oil with at least 1200 PPM ZDDP. Also, I'd Ideally like a JASO rated oil for the wet clutch that shares...
  2. R

    Can too much ZDDP be a bad thing for a flat tappet motor?

    My 2006 Yamaha Roadstar has a big, air cooled, 1700cc push rod v-twin, with flat tappet cams and a wet clutch that shares oil with the engine via a semi dry sump system. As such it requires high ZDDP oils designed for a wet clutch. [so no Rotella] I believe the minimum requirement is 1200 ppm...
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