backfire is good... at least you know you're getting spark. all that's left is getting the air fuel mixture at the correct ratio to light the mixture.
cleaning the bike out with WFO and no choke (it may be flooded), starts you off in a lean condition. by doing that and then trying your starting routine, you are going from a lean to rich mixture. most times, as the mixture crosses from too lean to rich, the bike will fire and start up.
hope it works.
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