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how can i fix my SYM Symply 50cc?

everytime i rev it the exhaust backfires and i loose speed and then it cuts out
can anyone help me sort it out???
Matthew, April 2008
Backfiring is usally a problem with the timing, eg; fuel igniting when the valves are not fully open/closed, get it retimed

Brian Horsman, August 2008
i would put a new spark plug in it

adam actual motorcycle mechanic since 1982, April 2008
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