Everything is fine with motor, its the normal EVO vibration. Its just my lower back that is sensitive. Nerve damage at lower back, that is getting worse even sitting on bike at idle for 10 minutes.... Forward sitting position makes me sit bit longer on rides.... The more I lean backwards, the worse is the experience, due the resonation is getting directly to the lowest backbones...
Just wondering those spring seats should isolate the resonation away from my sensitive arse->back..

, am I right?
E