Pete,
I have hundreds of kero starts on all different types of jetcat motors. Your problem is most likely a battery issue. Kero start is very demanding on batts so a lipo or in my favorite A123 is the way to go. A couple of other things to look at is the fuel actually moving thru the line to the kero plug when you hear the sol valve clicking. Many times a pump that would work perfect for propane start will need a little extra kick to get going during the kero start sequence. This is easily adjusted in the unaccel 1 screen. Sometimes it takes a click or two up in this setting to get things running smooth. Once you get dependable starts there will be no going back to propane start, you will love it.
V..