double-trouble

not new plugs but i no there not sparking

i called the place i took it and asked what was up and he told me once they bench tested it thats when they stoped working on it. i hate to complane cause i really didnt take the best atv to them i alredy had evry thing off the bike like plastic tank and stater cover. they told me too it might be the coil. just wanted more advice cuase he didnt sound to for sure. and i dont no how to cheack ohms on it. and im not the richest guy out there so its hard to keep throwing mony into tril and err

im kinda new with this site but it sounds like yall know yalls shit with banshee's. so i got a 99 banshee and iv just swaped frams bike ran great befor but now that ist all togather im haven sparking problems. at 1st the bike had no spark so i took it to a shop and had it checked out they said they fixed it and put a stater in it, but when i got it started at my house it did fine at 1st a little sputering at 1st but just figured cause it set so long? well i noticed the lights wernt shining bright when at idle. thought maybe the wire was shorting out or something simple so i shut it of to take a look noticed nothing wrong went to start it again and i had no spark gave up for the night next morning tryed to kick it and i had spark fired it up let it idle for a sec and it died. kicked it to restart it and nothing once again i lost my spark. basicly it seems when it is warm if it dies i wont have spark tell it cools off like an hour laiter. can someone pleas help me this thing was a blast.

my banshee wont fire after it is warm wait about 30min and it will start again for a few secounds then dies? it has a new stater just put on this how i got it back from the shop a week ago. any help would be nice thanks