Keihin PWK soft spring (Beta Xtrainer all years and 250/300 RR 2016-2017)
Beta installed PWK version with TPS integrated in the X-trainers models from 2015 and from 2106 as well in the 250/300 RR's.
The TPS help the ECU to configure the right amount of oil injected in to the manifold.
Problem is that Keihin use the very same spring as the non TPS version and the extra TPS spring create unnecessary hard throttle pull.
This spring will bring back the smooth easy pull as we know it from 2015 RR's or any KTM for that matter.
Same spring will work with all PWK to get even easier throtle pull than stan