When I try to start up the YS110 on my UCD60 for the first time (if I haven't flown for a few days) it takes about a minute of turning the engine over before the fuel starts to go through the engine. At that point I stop turning the engine over, attach the glow plug, flick it over once and it starts straight away.

Does anyone know why it takes so long for the fuel to start going through the engine? It almost seems like the fuel is congealing in the carb or something and it's taking a while to flush it through!?!?!?