My 8 yr old son is finding it difficult to keep his fingers on clutch lever of his Beta 50 Rev3 trials bike. Does anyone have any good suggestions re pulling lever in, or fitting hydraulic clutch to bike. It is currently a cable clutch?

To reduce the span of the lever for a small hand put a cable tie on the clutch lever bracket between the pivot and the cable adjuster. This will move the lever back towards the bars as it will not allow it to return fully. You will have to adjust the clutch for the decrease in lever travel. I did this on the front brake of my daughters PW80. Worked a treat.