After we discovered that the CVT was either slipping or not fully shifting, we moved the GoPro mount to the left side of the bike and pointed the camera towards the transmission. During the next run, we were able to document the CVT behavior.
It appears that the CVT simply does not shift all the way to top gear. We suspect that this is occurring because the diesel engine's redline is much lower than the redline of an equivalent gasoline engine. The CVT primary has three weighted rollers that are thrown outwards by centrifugal force and push the plate inwards, which changes the effective diameter of the pulley. If the engine rpm is too low, then they would not have enough force to completely shift. The solution is to either make custom heavyweight rollers, install weaker return springs, or some combination of the two.
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| Adjusting the transmission alignment with shims. Unfortunately, this didn't help all that much. |
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