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lamda sensors are a pain and only purpose is to protect the catalytic convertor which is why they lean the mixture if it gets too rich. Problem with that is the bikes are already lean for emissions and making them leaner may protect the catalytic convertor but leads to the issues you describe, crap low and constant speed running!
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 Roast Beef Monster!
Termignoni and Bucci - Italian for pipe and slippers! 
S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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