Changing Gear

Got a problem with shifting gears.

Whatever gear I am in it always shifts to the next one down. So that first is secon second is third and so on.

I h have decided that I should learn to maintain my bike so any ideas how I fix this.

I assume its simple but prob best to get advise rather than just fiddle.

By the way how often should I clean the bikejavascript:smilie('')
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http://sheldonbrown.com/derailer-adjustment.html
http://sheldonbrown.com/cables.html
or
http://www.parktool.com/repair_help/FAQrindx.shtml
http://www.parktool.com/repair_help/BCB4.shtml
or get the Barnetts chapters on the subjects.
If you received an owner's manual with your bicycle, you can consult it for cleaning and adjusting.

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David Ornee, Western Springs, IL USA

Many thanks answer found on Sheldon Brown - as simple as adjusting cable