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Old 08-26-2013, 10:35 PM   #2 (permalink)
Ryland
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Join Date: Jan 2008
Location: Western Wisconsin
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honda cb125 - '74 Honda CB 125 S1
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Unplug the O2 sensor, you will most likely find that the problem goes away, at that point buy a new O2 sensor, make sure it's a 5 wire sensor with the right plug, Denso or NTK, it might be close to $200 and if it's not then there is a good chance that it's not the right one.
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