You may have seen these motor mounts on James Stewart bike last week, and the Toyota/JGRMX/Yamaha crew have had some fun watching everyone speculate at what's going on underneath. They're still being pretty tight-lipped about what's happening with them, but they did say that it's not a rubber mount. Apparently there are some other pieces that also work with it that aren't as visible, and it's all part of a package to help with chassis tuning. Some of this is stuff that they've developed during testing at James' house, and it's just now hitting the track.
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Vital MX Pit Bits: St. Louis