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vor 503 misfiring

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does anyone know why the vor 503 misfires when given the gas hard?help!

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replace spark plug and cap.try bike now and see if problem persists.if it still misses,look at old spark plug.if it is black perhaps change out the main jet in your carb for a smaller one.if it is very light colored then change it out for a bigger main jet.this is a logical place to start.dan.

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Maybe A Sheared(ing) Woodruff Key,Moving The Stator Slightly And Altering The Spark. Has It Just Started?

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i had this issue, turned out to be either a faulty CDI or spark plug cap. I changed both (hence the either, or...)

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bike rides good at low rpms ,misses at higher rpms like timing is retarded or not advancing . thanx for all the help everyone as here in florida nobody knows nothin and i hear shouldabotahonda all the time, but now at least i know where to look ,i'll save up for a stator and the other stuff if i find out it needs it right now im going to check the key for shearing Z

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