1970 z50 problems

Original owners of the bike. Was riding it around about 2 years ago and it was running smootly and then the bike just started breaking up. So far, I cleaned the carb twice, Cleaned the fuel filter, Fresh fuel, checked ignition points (which are a only year old), New Spark Plug, Checked spark (seems strong), new fuel hose and checked timing. It seems like it idles ok but once u give it gas it breaks up and sputters and occasionally backfires through the carb. I posted a link to a poorly shot video but hopefully it gets the point across. Any clue to what it is? Thanks

Video link: http://http://www.youtube.com/watch?v=eALmv1I5mAA

Bump?

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