I am uncertain what a "gearbox speed sensor" is, but the actual speed sensor is right next to the starter motor. The starter motor is a silver cyclinder buried about half way down the the engine. And buried it is: the speed sensor appears almost impossible to access and very difficult to even see.
78 posts ยท Joined 2017. #5 ยท Oct 28, 2021. At 5' 9" and 29" leg I felt I needed some help on my new 2017 Twin when fettling it Jan 2018. (Started riding a tricycle nearer 70 years ago, now leg strength challenged) The Soupy's adjustable link is worth trying. I paid only $135 in USA.
2019 Honda CRF1000L Africa Twin detailed performance review, speed vs rpm and accelerations chart. Complete performance review and accelerations chart for Honda CRF1000L Africa Twin in 2019, the model with adventure touring body and 998.4 cm3 / 60.9 cui, 70 kW / 95 PS / 94 hp engine offered up to December 2019 fro Europe Japan .
. 86 147 282 213 219 257 146 182 18