Hmm.. well i know that when my mates Inferno wouldn't start (it has the gxr21 engine) it took alot of priming to get the fuel into the engine, just take your glowplug out, blow on to the exhaust gas pressure line and cycle the engine slowly whilst your doing this. Do this for a while until you see fuel splashing out the top of the cylinder head, then pull the engine pullstart hard as if youre trying to start it there should be quite a lot of fuel seen as its on factory settings. I know the inferno was hard to start but once we'd done this it started every time.