hey there

i had the same troubles with my hyper 7, it took me forever to start (took me 4 days and three different rc dudes to help) and i still have the bruised fingers from pull starting it. what i suggest is to firstly only use one washer on your glow plug. secondly try to turn over the engine in short bursts without the glow plug in whilst covering the cylinder head with your hand. have a look to see if your hand has some fuel spluttered on it? if it has then let the car breathe for a minute then put the plug back in. if you got splutter its probably flooded.

ok next is the fuel reaching the carb? if not blow into the pressure tube that is attached to your exhaust, that should feed fuel to your carb. thirdly make sure you have the factory settings for your engine before going further.

if your air filter is wet maybe you should try to determine what the moisture is. if its fuel then that is weird. if its water then you have to dry it out. water going into your fuel is not good.

and ambient temp can play a part in breaking in a new engine but if your other car wouldnt start then maybe it has something to do with it.
the other thing to consider is the fuel you use. fuels vary from batch to batch, even if they are the same brand.
hope ive been of some help.