i also had the same problem with my Behotec jb130 the glowplug behotec uses is a rossi 8 .
a very cold glowplug i changed it for a hotter glowplug a rossi 3 or a turbineglowplug from dreamworks is also good .
and from that moment it starts exelent evry time in the normal way
and lower the voltage to the glowplug in its factory setting