I had the same kickstart problem when I built the VH which I fitted with a GB gearbox (photo). After consulting with Geoff Brown I bought a new quadrant and ratched pinion which improved things no end, but it still occasionally got stuck. I was also having a strange problem changing up from 2nd to 3rd and 3rd to 4th. I found by trial and error that if I lifted the gear lever ever so slightly before pressing down to engage 3rd/4th then it worked fine. On closer examination I found that the gearchange lever shaft was a loose fit in the outer case bush and I ended up changing the outercase for another one that I had and which was a much better fit and cured the problem, as a bonus the occasional kickstart problem has all but disappeared and if it does stick slightly it frees off with a good firm boot.
By the way for anyone considering fitting a gps speedo in a panel tank I should also have added to my previous post that I did have a slight problem as the depth of the tank under the panel was about 8mm or 5/16th inch too small. This could be due to it being of Indian manufacture as (although I've not taken measurements) the depth appears to be less than on the original panel tank that graces my 1946 NH. I got round the problem by fitting a thick rubber band under the bezel (photo). The rubber band used is one of the wristbands that are commonly used for rallies and festivals and I bought a number of black coloured ones off ebay figuring that any spares would come in useful somewhere along the line.